JP2001101657A - Magnetic transfer method and magnetic transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer high-grade transfer patterns from a master carrier to a slave medium by magnetic transfer regardless of the positions of magnetic patterns by the magnetic transfer. SOLUTION: In the magnetic transfer method of bringing the master carrier for magnetic transfer formed with a magnetic layer in a portion corresponding to the information signal on the surface of a substrate and a magnetic recording medium which is the slave medium to receive the transfer into contact and impressing a magnetic field for transfer thereto, the recorded information of the master carrier for magnetic transfer is transferred by bringing the slave medium and the master carrier into tight contact with each other and subjecting both to initial DC magnetization in this state with magnetic field of intensity of 1.5 times the coercive force HCS of the slave medium, then applying the magnetic field of the direction reverse from the initial DC magnetization thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording a large amount of information at a time on a magnetic recording medium,
The present invention relates to a method for transferring recorded information to a magnetic recording medium having a high recording density.

[0002]

2. Description of the Related Art The amount of information handled by personal computers and the like has been dramatically increased due to the progress of use of digital images and the like. Due to the increase in the amount of information, there is a demand for a large-capacity, inexpensive magnetic recording medium for recording information and a short recording and reading time. High-density recording media such as hard disks, ZIP
In a high-density floppy disk type magnetic recording medium represented by (Iomega), the information recording area is composed of narrow tracks as compared with a general floppy disk.
In order to accurately scan a narrow track width with a magnetic head and perform signal recording and reproduction at a high S / N ratio, it is necessary to perform accurate scanning using a tracking servo technique.
Therefore, in a large-capacity magnetic recording medium such as a hard disk or a removable magnetic recording medium, a servo signal for tracking, an address information signal, a reproduction clock signal, and the like are recorded at intervals within one round of the disk. A so-called preformat is performed. The magnetic head can read the preformatted signal and correct its own position to accurately travel on the track.

The current preformat is manufactured by recording disks one by one and one track at a time using a dedicated servo recording device. There is a problem that the servo recording device is expensive, and it takes a long time to manufacture the preformat, so that it takes a long time to manufacture, which also affects the manufacturing cost. Therefore, a method of performing magnetic transfer without preformatting one track at a time has been proposed. For example, JP-A-63-183623, JP-A-10-4
Japanese Patent No. 0544 and Japanese Patent Application Laid-Open No. 10-269566 introduce a transfer technique. However, in the magnetic transfer method, no practical proposal has been made, including the conditions of the magnetic field applied during transfer and specific means for generating the magnetic field.

As a recording method for solving such a conventional problem, Japanese Unexamined Patent Publication (Kokai) No. 63-183623 and Japanese Unexamined Patent Publication (Kokai) No. 10-45544 disclose a method of forming an uneven shape corresponding to an information signal on the surface of a substrate. The surface of the magnetic transfer master carrier in which the ferromagnetic thin film is formed on at least the convex surface of the uneven shape is brought into contact with the surface of the sheet-shaped or disk-shaped magnetic recording medium on which the ferromagnetic thin film or the ferromagnetic powder coating layer is formed, Alternatively, there has been proposed a method of recording a magnetization pattern corresponding to an uneven shape on a magnetic recording medium by applying an AC bias magnetic field or a DC magnetic field to excite a ferromagnetic material forming the surface of the convex portion.

In this method, the surface of the convex portion of the master carrier for magnetic transfer is brought into close contact with the magnetic recording medium to be preformatted, that is, the slave medium, and at the same time, the ferromagnetic material constituting the convex portion is excited to form the slave medium. This is a method by transfer to form a predetermined format. Recording can be performed statically without changing the relative position between the magnetic transfer master carrier and the slave medium, and accurate preformat recording is possible. It has the feature of. In addition, the time required for recording is very short. That is, in the method of recording from the above-described magnetic head, there is a problem that usually several minutes to several tens of minutes are required, and the time required for transfer becomes longer in proportion to the recording capacity. In this case, the transfer can be completed in one second or less regardless of the recording capacity or recording density.

Referring to FIG. 1, transfer of a preformat pattern on a magnetic transfer master carrier will be described. FIG. 1A is a plan view schematically illustrating a magnetic layer surface of a magnetic transfer master carrier, and FIG. 1B is a cross-sectional view illustrating a transfer process. In a predetermined area of a track of the magnetic transfer master carrier 1, a preformat area 2 and a data area 3 in which patterns of a tracking servo signal and an address signal to be transferred are formed are formed. The preformat information can be transferred as recording information 7 to the slave medium side by applying a transfer external magnetic field 6 in the track direction 5 by bringing the slave medium 4 into close contact with the slave medium 4, so that the slave medium can be manufactured efficiently. Can be done. However, it has been clarified that when the transfer is performed by such a method, the information signal quality may be poor, and the servo operation may be inaccurate in some cases.

[0007]

According to the present invention, the servo operation of a slave medium manufactured by transferring a preformat pattern by applying an external magnetic field while closely adhering a magnetic transfer master carrier and a slave medium becomes inaccurate. In particular, it is an object of the present invention to provide a stable transfer method and apparatus by preventing a magnetic transfer method and a magnetic transfer method for continuously performing a series of steps of initial DC magnetization of a slave medium and transfer of recorded information. It is an object to provide a transfer device.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic transfer master carrier in which a magnetic layer is formed at a portion corresponding to an information signal on the surface of a substrate, and a slave medium to be transferred being brought into close contact with a transfer medium. In the magnetic transfer method in which a magnetic field is applied, the initial magnetization performed before the magnetic transfer can be solved by a magnetic transfer method in which the magnetic transfer master carrier and the slave medium are in close contact with each other. Further, in a magnetic transfer method in which a transfer magnetic field is applied by closely adhering a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate and a slave medium to be transferred, the magnetic transfer master With the carrier and the slave medium in close contact, a magnetic field is applied in the track direction on the slave medium surface,
This is a magnetic transfer method in which after the magnetization of the slave medium is initially DC-magnetized in the track direction, a transfer magnetic field is applied in the track direction on the surface of the slave medium to perform magnetic transfer. A magnetic field of a magnetic field intensity distribution having at least one magnetic field intensity portion at least at one position in the track direction at least 1.5 times the coercive force _Hcs of the slave medium is generated in a part of the track direction. The magnetic transfer method described above applies a magnetic field for initial DC magnetization of the slave medium magnetization in the track direction by rotating the magnetic field in the track direction, or by rotating the magnetic field in the track direction.

In a magnetic transfer method in which a transfer magnetic field is applied by bringing a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate into close contact with a slave medium to be transferred, 1. Coercive force _Hcs
A magnetic field having an initial DC magnetization magnetic field intensity distribution of 5 times or more is generated in a part of the track direction, and after the initial DC magnetization magnetic field is applied, the magnetic medium for magnetic transfer is applied to the slave medium surface so that the magnetic transfer magnetic field is applied to the slave medium surface. In a state where the magnetic transfer master carrier is in close contact with the master carrier for magnetic transfer, by rotating the contact body or the magnetic field, a magnetic field is applied in the track direction to the slave medium surface in a state where the master carrier for magnetic transfer and the slave medium are in close contact with each other, This is a magnetic transfer method in which a transfer magnetic field is applied to the surface of the slave medium immediately after the initial DC magnetization of the magnetization of the slave medium to perform magnetic transfer. Further, the coercive force H _cm of the magnetic layer of the master carrier for magnetic transfer is 47.7kA / m (600O
e) The magnetic transfer method described above, which is as follows. Coercivity H _cs of the slave medium under the transcriptional is 143kA / m (180
0 Oe) or more. In the above magnetic transfer method, a direction in which a magnetic field in a track direction is applied to the slave medium to perform initial DC magnetization and a transfer magnetic field applied for performing magnetic transfer are opposite on the slave medium surface. There is no part in the track direction where the magnetic field strength exceeds the maximum value of the optimum transfer magnetic field strength range,
There is at least one or more magnetic field strength portions within the optimum transfer magnetic field strength range in one track direction, and the magnetic field strength in the opposite track direction is the minimum of the optimum transfer magnetic field strength range at any track direction position. A magnetic field with a magnetic field intensity distribution less than the value is generated in a part of the track direction, and the magnetic carrier is rotated in the track direction with the magnetic transfer master carrier and the initial DC magnetized slave medium in close contact, or the magnetic field is rotated in the track direction. The above magnetic transfer method applies a transfer magnetic field in the track direction of the slave medium surface. The optimum transfer magnetic field strength is 0.6 × H _{cs to} 1.3 with respect to the coercive force H _{cs of the} slave medium.
× H _cs .

In a magnetic transfer apparatus for applying a transfer magnetic field by closely adhering a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate and a slave medium to be transferred, A means for adhering the transfer master carrier and the slave medium, and applying a magnetic field in the track direction on the slave medium surface in a state where the magnetic transfer master carrier and the slave medium are adhered to each other so that the magnetization of the slave medium is initialized in the track direction in advance. The magnetic transfer apparatus includes an initial DC magnetizing means for magnetizing, and a transfer magnetic field applying means for applying a transfer magnetic field in the track direction of the slave medium in a state where the master medium for magnetic transfer and the slave medium having the initial DC magnetization are in close contact with each other. The above magnetic transfer apparatus, wherein the coercive force H _cm of the magnetic layer of the magnetic transfer master carrier is 47.7 kA / m (600 Oe) or less. Coercivity H _cs of the slave medium under the transcriptional is 143kA / m (1800Oe)
The magnetic transfer apparatus described above. In the above magnetic transfer apparatus, a direction in which a magnetic field in the track direction is applied to the slave medium to perform initial DC magnetization and a transfer magnetic field applied to perform magnetic transfer are opposite to each other on the surface of the slave medium.

The initial DC magnetizing means has a magnetic field intensity portion which is 1.5 times or more the coercive force _Hcs of the slave medium in only one direction in the track direction, and the magnetic field intensity in the opposite direction depends on any position in the track direction. However, a magnetic field having a magnetic field strength distribution that is less than the coercive force _{Hcs of} the slave medium is generated in a part of the track direction, and by rotating the magnetic body in the track direction or the close contact body between the slave medium and the magnetic transfer master carrier. And a magnetic transfer device for applying a magnetic field for initial DC magnetization of the slave medium magnetization in the track direction. Further, the transfer magnetic field applying means does not have a magnetic field strength exceeding the maximum value of the optimum transfer magnetic field strength range in any track direction position, and at least a portion having a magnetic field strength within the optimum transfer magnetic field strength range in one track direction. Means for generating a magnetic field having a magnetic field intensity distribution in a part of the track direction in which the magnetic field intensity in the track direction in the opposite direction is less than the minimum value of the optimum transfer magnetic field intensity range at any position in the track direction. Means for rotating the master carrier for magnetic transfer in the track direction with the initial DC magnetized slave medium in close contact, or means for rotating the magnetic field in the track direction for transfer in the track direction on the surface of the slave medium. The above magnetic transfer device applies a magnetic field.

In a magnetic transfer apparatus for applying a transfer magnetic field by bringing a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate into close contact with a slave medium to be transferred, 1. Coercive force _Hcs
Means for applying an initial DC magnetization of 5 times or more, magnetic field applying means for magnetic transfer within an optimum transfer magnetic field strength range opposite to the direction of the magnetic field for initial DC magnetization, and bringing the slave medium and the magnetic transfer master carrier into close contact with each other A rotating means for rotating one of a magnetic body in the track direction and a contact body between the slave medium and the master carrier for magnetic transfer and a rotating means for rotating one of the magnetic fields in the track direction; Immediately after a magnetic field is applied in the track direction of the slave medium and the magnetization of the slave medium is initially DC-magnetized in the track direction, the transfer medium is applied in the track direction of the slave medium in a state in which the master carrier for magnetic transfer and the slave medium with the initial DC magnetization are in close contact. The above magnetic transfer apparatus performs a magnetic transfer by applying a voltage. Optimal transfer magnetic field intensity is the magnetic transfer apparatus is _{0.6 × H cs ~1.3 × H cs} .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors closely contact a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate with a slave medium to be transferred, and apply a transfer magnetic field. The present invention has been conceived by finding out that in the applied magnetic transfer method, it is possible to perform the initial magnetization performed before the magnetic transfer in a state in which the magnetic transfer master carrier and the slave medium are in close contact with each other. Also, when the magnetic transfer master carrier and the slave medium are brought into close contact with each other and a transfer magnetic field is applied from outside to transfer the recorded information recorded on the magnetic transfer master carrier to the slave medium, the transfer is unstable and the signal quality is low. Was found to be caused by the deterioration of signal quality due to improper magnetic field applied at the time of transfer, and the slave medium and the master carrier for magnetic transfer were brought into close contact with each other. In the state
It has been found that it is possible to provide a method and apparatus for transferring the recording information from the master carrier for magnetic transfer and the initial DC magnetization of the slave medium to the slave medium, and furthermore, to transfer the recording information to the slave medium. It has been found that by performing the transfer immediately after the initial DC magnetization of the slave medium, it is possible to provide a transfer method and a transfer apparatus capable of performing the transfer step in an extremely short time. In the magnetic transfer from the master carrier for magnetic transfer to the slave medium, when an external magnetic field higher than the coercive force _{Hcs of} the slave medium is applied, all the magnetization states of the slave medium are magnetized in the applied direction. It was generally thought that the pattern to be recorded was not recorded. For example, Japanese Patent Application Laid-Open No. 10-45544 also describes in paragraph 0064 that it is preferable that the holding force be equal to or less than the coercive force of the magnetic recording medium.

However, according to the study of the present inventors, the principle of the magnetic transfer in this method is as shown in FIG. 1, as shown in FIG. In this case, the transfer external magnetic field 6 becomes a magnetic field 6 a absorbed by the convex portion thereof, and does not have a magnetic field strength that can be recorded in the magnetic layer of the slave medium 4 in contact therewith. The magnetic layer of the slave medium 4 corresponding to the concave portion which has not been recorded has a recordable magnetic field intensity, and is magnetized in the direction of the transfer external magnetic field 6 as shown in FIG. It has been found that the pattern can be transferred as the recording information 7 to the slave medium 4.

Therefore, from the master carrier for magnetic transfer,
When transferring to the slave medium,
In the area where many magnetic fields are generated,
To enter the turn section, the coercive force H_cs
Is not reversed even when a higher transfer magnetic field is applied
Can be Then, the coercive force H of the slave medium_csCompared to
To apply a transfer magnetic field with a specific relationship strength
Therefore, a slave medium with high signal quality can be obtained.
You. The slave medium and the master carrier for magnetic transfer
In the track direction of the slave medium
Coercive force H of probe medium_cs1.5 times or more, preferably 2 times
Apply a sufficiently large magnetic field as described above and set the slave medium
Immediately after the current magnetization, the initial DC
The transfer magnetic field is applied in the direction opposite to the
You. The transfer magnetic field has a specific strength,
That is, a magnetic field within the optimum transfer magnetic field strength range is applied.
Therefore, the preferable magnetic field for transfer is the coercive force H of the slave medium. _cs
0.6 × H_cs≦ Transfer magnetic field ≦ 1.3 × H_cs The direction is applied in the direction opposite to the direction of the initial DC magnetization
Is what you do. Further, the transfer magnetic field is more preferably
0.8-1.2H_csAnd more preferably 1-1.
1H_csIt is. Therefore, disc-shaped recording media
To transfer the pattern formed radially around the central axis
To do this, a master carrier for magnetic transfer and a slave medium
In the track direction on the slave medium surface,
That is, in a disk-shaped slave medium, an arbitrary circumference
A magnetic field is applied in the tangential direction of the arc at the
The body magnetization is initially DC-magnetized in the track direction. Then,
The master carrier for magnetic transfer and the slave medium immediately after
In the track direction on the slave medium surface
The transfer is performed by applying a magnetic field for copying. And
Apply a magnetic field in the track direction to the slave medium, and
Direction and transfer magnetism applied for magnetic transfer
The field must be reversed on the slave medium
I found it.

Therefore, in a disk-shaped recording medium,
In order to transfer the pattern formed radially around the central axis, the magnetic recording master carrier and the slave medium are in close contact with each other, and in the track direction of the slave medium surface, that is, in a disk-shaped slave medium, A magnetic field is applied in the tangential direction of the arc at the circumferential position of, and the slave medium magnetization is initially DC-magnetized in the track direction in advance. Next, in a state where the master carrier for magnetic transfer and the slave medium are in close contact with each other, a transfer magnetic field is further applied in the track direction on the surface of the slave medium to perform transfer. Then, it was found that it is necessary that the magnetic field in the track direction be applied to the slave medium, and the transfer magnetic field applied to perform the magnetic transfer be opposite to the direction of the initial DC magnetization on the surface of the slave medium.

Therefore, in order to apply a magnetic field under the above-mentioned applied magnetic field condition over the entire surface of the disk-shaped medium by the above-mentioned magnetic field applying method, a magnetic field intensity distribution 1.5 times or more the coercive force _Hcs of the slave medium must be applied in the track direction. A magnetic field having a magnetic field intensity distribution having at least one or more magnetic fields is generated in a part of the circumferential direction, and the magnetic recording master carrier and the slave medium are brought into close contact with each other, or the magnetic field is rotated in the track direction so that the slave medium is A magnetic field for initial DC magnetization in the track direction is applied. And
Thereafter, a magnetic field intensity exceeding the maximum value of the optimum transfer magnetic field intensity range does not exist in any track direction position, and at least one portion having a magnetic field intensity within the optimum transfer magnetic field intensity range exists in one track direction. Then, a magnetic field having a magnetic field intensity distribution such that the magnetic field intensity in the opposite track direction is less than the minimum value of the optimum transfer intensity range at any track direction position is generated in a part of the circumferential direction. It is necessary to apply a transfer magnetic field in the track direction of the slave medium surface by rotating in the track direction while keeping the master carrier and the initial DC magnetized slave medium in close contact, or by rotating the magnetic field in the track direction. It is.

In the magnetic transfer method of the present invention, the master medium for magnetic transfer and the slave medium are brought into close contact with each other, and the magnetization for the initial DC magnetization of the slave medium is applied to initially magnetize the slave medium. Immediately after the magnetic transfer master carrier and the slave medium are in close contact with each other, the magnetic transfer for the initial DC magnetization is performed continuously by applying a magnetic field for the initial DC magnetization. While the DC magnetization is progressing, the magnetic transfer is performed by applying a transfer magnetic field to the region where the initial DC magnetization has already been performed. In the present invention, the term “immediately” means that a transfer magnetic field is applied at a short time interval after the initial DC magnetization, and when the initial DC magnetization is performed on a part of the target slave medium, the initial DC magnetization is increased. It also means that a transfer magnetic field is applied to the completed area. Further, the interval at which the transfer magnetic field is applied subsequent to the application of the initial DC magnetic field can be arbitrarily determined, but may be any distance as long as the initial DC magnetic field and the transfer magnetic field having a predetermined strength can be simultaneously applied.

The magnetic field for initial DC magnetization and the magnetic field for transfer can be applied to a predetermined portion of the contact body by arranging a plurality of permanent magnets or electromagnets. The initial DC magnetization was completed immediately before the transfer magnetic field in the opposite direction, while giving the magnetic field for initial DC magnetization from the same magnet by adjusting the angle made with the body, but in the opposite direction, within the optimal transfer range. It may be applied to a region.

Specific examples of a device for generating and applying a magnetic field for initial DC magnetization include the following. FIG.
FIG. 3 is a diagram for explaining a magnetic field generation and application device using a single permanent magnet having a magnetic field symmetric with respect to the center axis of a magnetic pole with respect to a slave medium surface. FIG. 2A shows the slave medium 4.
An example is shown in which the slave medium is rotated in a state in which a magnetic field is applied by the permanent magnet 8 to the upper surface of the closely adhered body 15 between the slave medium and the magnetic transfer master carrier 1. From a single permanent magnet 8 provided on the upper surface of the closely adhered body 15 of the slave medium 4 and the master carrier 1 for magnetic transfer, as shown in FIG.
The contact body 15 or the permanent magnet 8 is rotated in the track direction with respect to the center axis of the slave medium while the magnetic field 9 in the parallel track direction is applied. ), A magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to perform initial DC magnetization. In the example shown in FIG. 2, an example is shown in which the slave medium is provided on the upper surface, but may be provided on the lower surface.

FIG. 3 is a diagram for explaining the application of an asymmetric magnetic field by a single permanent magnet. FIG. 3A is a diagram for explaining the application of an asymmetric magnetic field, and FIG.
FIG. 4 is a diagram illustrating the strength of a magnetic field given by application of a magnetic field. Slave medium 4 and magnetic transfer master carrier 1
A method for applying a magnetic field for initial DC magnetization using the inclined permanent magnet 81 provided on the upper surface of the contact body 15 of FIG. By rotating 81 in the track direction with respect to the central axis of the slave medium, an asymmetric magnetic field is applied to cause initial DC magnetization. One of the small peaks 13 applied to the contact body 15 has no effect on the initial DC magnetization of the slave medium, and has only a large peak 14 having an intensity of 1.5 times or more the coercive force _Hcs of the slave medium. Causes the action of initial DC magnetization.

When the magnetic pole axis of the permanent magnet is inclined obliquely with respect to the slave medium surface to give a magnetic field for initial DC magnetization, the optimum value of the magnetic pole axis inclination is determined by the shape of the magnet. In the case of a rectangular parallelepiped permanent magnet, the angle θ between the surface perpendicular to the axis of the magnetic pole and the slave medium surface is preferably 5 ° to 70 °, and 20 ° to 5 °.
More preferably, it is 5 °.

FIG. 4 is a diagram for explaining a method of applying a magnetic field using two opposing permanent magnets. FIG. 4A shows a close contact body 1 between the slave medium 4 and the magnetic transfer master carrier 1.
5 shows an example in which the permanent magnets 8a and 8b magnetized symmetrically with respect to the axis of the magnetic pole are rotated on the upper and lower surfaces of the magnet 5 with the same type of magnetic pole facing the contact body 15. Close contact body 15
Permanent magnets 8a and 8 provided on the upper and lower surfaces of
4B, a magnetic field 9 is applied to the surface of the slave medium 4 as shown in FIG. FIG. 4C is a diagram showing the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium has a peak 10 exceeding 1.5 times the coercive force _HCS of the slave medium. By rotating, the slave medium can be initially DC-magnetized.

FIG. 5 is a diagram for explaining a method of applying a magnetic field using two inclined permanent magnets. FIG. 5A is a diagram for explaining a method of applying an asymmetric magnetic field to the slave medium surface, and FIG. 5B is a diagram for explaining the strength of the magnetic field given by the application of the magnetic field of FIG. It is. Single inclined permanent magnets 81a and 81b magnetized symmetrically about the axis of the pole
On the upper and lower surfaces of the close contact body 15 between the slave medium 4 and the magnetic transfer master carrier 1 with the same poles facing each other with the close contact body 15 interposed therebetween, and the distance between the permanent magnet ends at one end in the track direction. D1 is the distance D between the permanent magnet ends at the other end.
2, the magnetic field intensity distribution in the track direction is made asymmetrical by disposing it obliquely, and an asymmetric magnetic field 12 is applied to the surface of the slave medium 4 so that the adhered body 15 or the inclined permanent magnet 81a and By rotating 81b in the track direction with respect to the center axis of the contact body 15,
The initial DC magnetization is achieved by applying an asymmetric magnetic field to the entire surface of the slave medium. Of the asymmetric magnetic field,
One of the small peaks 13 has no effect on the initial DC magnetization of the slave medium, and only the large peak 14 having an intensity of 1.5 times or more the coercive force _Hcs of the slave medium is affected by the initial DC magnetization. Will be done.

When the transfer magnetic field is applied by inclining the axis of the magnetic pole of the permanent magnet with respect to the slave medium surface, the optimum value of the inclination of the axis of the magnetic pole changes depending on the shape of the magnet. In the case of a permanent magnet, the angle θ between the surface perpendicular to the axis of the magnetic pole and the surface of the slave medium is 5 ° to 70 °.
°, more preferably 20 ° to 55 °.

FIG. 6 is a diagram for explaining a method of applying a magnetic field using a horizontal permanent magnet. FIG. 6A shows a permanent magnet 8 having a magnetic field symmetrical with respect to the axis of the magnetic pole, on the upper surface of a close contact body 15 between the slave medium 4 and the master carrier 1 for magnetic transfer.
Shows an example in which the contact body 15 is rotated in a state where the axis of the magnetic pole is arranged parallel to the surface of the slave medium 4. A magnetic field 9 is applied from a single permanent magnet 8 provided on the upper surface of the contact body 15 to the surface of the slave medium 4 as shown in FIG. FIG. 6C is a diagram showing the magnetic field intensity given to the slave medium. The magnetic field applied to the slave medium includes
Peak 1 exceeding 1.5 times the coercive force _Hcs of the slave medium
0 is present, and the slave medium can be initially DC-magnetized by rotating the close contact body between the slave medium and the master carrier for magnetic transfer or by rotating a magnet. In the example shown in FIG. 6, an example is shown in which the magnet is arranged only on the upper surface of the contact body, but it may be provided on the lower surface of the contact body, or on both the upper surface and the lower surface.

FIG. 7 shows a magnetic field using a permanent magnet in which two pairs of magnets are disposed adjacent to each other with a close contact body perpendicular to the slave medium surface of the close contact body between the slave medium and the magnetic transfer master carrier. It is a figure explaining an application method. FIG. 7A shows a close contact body 1 between the slave medium 4 and the magnetic transfer master carrier 1.
A pair of permanent magnets 8a and 8b having a magnetic field symmetric with respect to the axis of the magnetic pole are arranged on the upper and lower surfaces of the magnetic pole 5 so that the same type of magnetic poles are opposed to each other. So that a pair of permanent magnets 8c and 8d
Is arranged. An example in which the close contact body 15 is rotated in such a state is shown. Since the single permanent magnets 8a and 8b are arranged on the upper and lower surfaces of the contact body 15 with the same poles facing each other, as shown in FIG.
The magnetic fields of the permanent magnets 8a and 8b repel each other, and the magnetic field of the permanent magnet 8a
c, the magnetic field of the permanent magnet 8 b generates a magnetic field toward the permanent magnet 8 d of the other pair of adjacent permanent magnets, and the magnetic field 9 is applied to the surface of the slave medium 4.

FIG. 7C is a diagram showing the magnetic field strength applied to the slave medium. The magnetic field applied to the slave medium has a peak 10 that exceeds 1.5 times the coercive force _Hcs of the slave medium, and the slave medium is initialized by rotating the contact body 15 or rotating the magnet. DC magnetization is possible. The distance between the opposing magnets arranged adjacent to each other is such that the magnetic field in the track direction formed by the adjacent magnets applies a magnetic field of 1.5 times or more the coercive force of the slave medium to the adhered body. May be arranged at a possible distance.

FIG. 8 is a diagram for explaining a method of applying a magnetic field in which two permanent magnets are arranged adjacent to one surface of an adhered body of a slave medium and a magnetic transfer master carrier. FIG.
(A) shows two permanent magnets 8 on one surface of the contact body 15.
The magnetic poles a and 8b are arranged such that the axes of the magnetic poles are perpendicular to the contact body 15 so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have opposite polarities. An example in which the close contact body 15 is rotated in such a state is shown. As described above, the two permanent magnets 8a and 8b are connected to one surface of the contact body 15 so that the directions of the magnetic poles are opposite to each other, that is, the axes of the respective magnetic poles are opposite in polarity. As shown in FIG.
As shown in (B), the magnetic field of the permanent magnet 8 a generates a magnetic field directed to the adjacent pair of permanent magnets 8 b, and the magnetic field 9 is applied to the surface of the slave medium 4. FIG. 8 (C)
FIG. 4 is a diagram showing a magnetic field intensity given to a contact body. The magnetic field applied to the contact body has a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium, and the slave medium is rotated by rotating the contact body or by rotating two magnets. The initial DC magnetization can be made. The distance between the adjacent magnets is such that the magnetic field formed by the adjacent magnets can apply a magnetic field of 1.5 times or more the coercive force _Hcs of the slave medium to the close contact body. What is necessary is just to arrange at a distance.

FIG. 9 is a diagram for explaining a method of applying a magnetic field arranged on the contact surface with the end faces of both magnetic poles of one permanent magnet facing the contact surface. FIG. 9A shows a state in which a magnetic field is applied to the upper surface side of the close contact body 15 between the slave medium 4 and the magnetic transfer master carrier 1 with the end surfaces 8x and 8y of both magnetic poles of the permanent magnet 8 facing the close contact body 15. 2 shows an example in which the close contact member is rotated. As shown in FIG. 9B, a state in which a parallel magnetic field 9 in the track direction is applied to the slave medium surface from the end faces 8x and 8y of both magnetic poles of the single permanent magnet 8 provided on the upper surface of the contact body 15 The contact member 15 or the permanent magnet is rotated in the track direction with respect to the center axis of the contact member,
For the slave medium surface, as shown in FIG.
Peak 1 exceeding 1.5 times the coercive force _Hcs of the slave medium
A magnetic field having 0 is applied to perform initial DC magnetization.
In the example shown in FIG. 9, one permanent magnet is provided on the upper surface of the slave medium. However, the permanent magnet may be provided on the lower surface or on both surfaces.

The magnet used for applying a magnetic field with the end faces of both magnetic poles facing the contact surface can be a U-shaped, horseshoe-shaped, arc-shaped, elliptical-arc-shaped magnet, etc. Permanent magnets whose axes are not parallel but intersecting may be used. The end faces of the magnetic poles are not limited to those parallel to the slave medium surface, but may be inclined.

FIG. 10 is a view for explaining an example of a permanent magnet in which the end faces of both magnetic poles of the permanent magnet are arranged facing the slave medium surface and a magnetic field can be applied to the slave medium by both magnetic poles. In the permanent magnet 8 shown in FIG. 10A, both end faces of the permanent magnet shown in FIG. 9 are parallel to the slave medium, while the end faces 8x and 8y of both magnetic poles are opposed to the slave medium face. it is obtained by inclined at an angle of inclination theta ₁ of the outward outward. The outward inclination angle θ ₁ is 30
° or less, more preferably 10 ° or less.

The permanent magnet 8 shown in FIG. 10 (B) is different from the permanent magnet shown in FIG.
The center axes of the two magnetic poles are permanent magnets that are not parallel but intersect with each other. The relation between the end faces of both magnetic poles and the slave medium 4 is the same as that shown in FIG. 9 except that the action surface for applying a magnetic field to the slave medium is the same as that shown in FIG. Has the effect of

The permanent magnet 8 shown in FIG.
End faces 8x and 8y of both poles of the permanent magnet shown in FIG.
Has an inward inclination angle θ ₂ inclined inward with respect to the contact body 15. The inward inclination angle θ ₂ formed with the slave medium surface is preferably 90 ° or less, more preferably 30 ° or less.

Further, the permanent magnet shown in FIG.
Although the central axes of both magnetic poles cross each other, the end faces of both magnetic poles of a U-shaped magnet in which the central axes of both magnetic poles are parallel may have an inward inclination angle. The permanent magnet 8 shown in FIG. 10D has an elliptical shape as a whole, and has an inward inclination angle in which the end surfaces 8x and 8y of both magnetic poles of the permanent magnet are inclined inward with respect to the surface of the contact body 15. θ ₃ . The inward tilt angle θ ₃ that forms the slave medium surface is shown in FIG.
90 ° or less is preferable as in the case of 0 (C),
It is more preferably at most 30 °.

FIG. 11 is a diagram for explaining a method of applying a magnetic field in which an electromagnet is provided on one of the upper surface and the lower surface of a closely adhered body in which a slave medium and a magnetic transfer master carrier are closely adhered. FIG. 11A shows an example in which the close contact body is rotated while a magnetic field is applied to the close contact body 15 by the electromagnet 82, and FIG.
FIG. 1B is a diagram illustrating a magnetic field applied to the contact body, and FIG. 11C is a diagram illustrating a magnetic field intensity applied to the contact body. As shown in FIG.
The single electromagnet 82 provided on the upper surface of the magnet 5 is supplied with a DC current from the DC power supply 16 and is DC-excited. The axis of the magnetic pole formed by the electromagnet 82 is arranged perpendicular to the slave medium surface. ing. Then, as shown in FIG. 11 (B), a magnetic field 9 parallel to the slave medium surface is applied to the slave medium 4, whereby the slave medium has the following characteristics as shown in FIG. 11 (C). Coercive force H of slave medium
A magnetic field having a peak 10 exceeding 1.5 times _cs is applied to perform initial DC magnetization. In the example shown in FIG.
Although the example in which it is provided on the upper surface of the contact body 15 is shown, the same applies to the lower surface.

FIG. 12 is a diagram for explaining a method of applying a magnetic field using a gradient electromagnet. FIG. 12A is a diagram for explaining application of an asymmetric magnetic field, and FIG.
It is a figure explaining the intensity of the magnetic field given by application of the magnetic field of (A). This is a description of a method of applying a transfer magnetic field to a surface of a close contact body in which a slave medium and a magnetic transfer master carrier are in close contact with each other by using a gradient electromagnet 83 which is DC-excited. By rotating the contact body 15 or the inclined electromagnet 83 in the track direction with respect to the central axis of the contact body 15, an asymmetric magnetic field is given to perform initial DC magnetization. Among the peaks given to the slave medium, one of the peaks 13 having a small intensity does not affect the initial DC magnetization of the slave medium at all, and only the peak 14 having a large intensity acts as the initial DC magnetization. .

FIG. 13 is a diagram for explaining a method of applying a magnetic field using two electromagnets. FIG. 13A is a perspective view, and FIG. 13B is a cross-sectional view. Slave medium 4
The electromagnets 82a and 82b magnetized symmetrically with respect to the axis of the magnetic poles are provided on the upper and lower surfaces of the contact body 15 in which the master medium 1 for magnetic transfer is in close contact with the master carrier 1, and the slave medium is rotated with the same type of magnetic poles facing each other. An example is shown, and a DC exciting current is applied to the electromagnets 82a and 82b from the DC power supplies 16a and 16b, respectively. Then, the magnetic field 9 is applied to the surface of the slave medium 4 from the electromagnets 82a and 82b provided on the upper surface and the lower surface of the contact body 15. FIG.
FIG. 3C is a diagram showing the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium, there are a peak 10 of more than 1.5 times the coercive force H _CS of the slave medium, the initial DC magnetization of the slave medium by rotating the or electromagnets rotating the contact body Can be.

FIG. 14 is a diagram for explaining a method of applying a magnetic field using two inclined electromagnets. FIG. 14A is a diagram illustrating a method of applying an asymmetric magnetic field, and FIG.
FIG. 14 is a diagram illustrating the strength of a magnetic field given by application of the magnetic field in FIG. Single inclined electromagnets 83a and 83b magnetized symmetrically with respect to the axis of the magnetic pole by a DC exciting current are arranged so that the same poles are opposed to each other with a close contact body 15 in which a slave medium and a magnetic transfer master carrier are in close contact with each other, and a track direction. The magnetic field intensity distribution in the track direction is made asymmetrical by obliquely disposing the electromagnet end distance D3 at one end different from the electromagnet end distance D4 at the other end. A magnetic field 12 is applied to the surface of the magnetic recording medium, and the adherent body 15 in which the slave medium and the magnetic transfer master carrier are in close contact, or the inclined electromagnets 83a and 83
b is rotated in the track direction with respect to the center axis of the close contact member 15, and an asymmetric magnetic field is applied to the entire surface of the slave medium to cause initial DC magnetization. In the asymmetric magnetic field, one of the peaks 13 having a small intensity does not affect the initial DC magnetization of the slave medium at all, and only the peak 14 having a large intensity acts as the initial DC magnetization.

FIG. 15 is a diagram for explaining a method of applying a magnetic field in which two pairs of electromagnets are arranged adjacent to each other with the slave medium interposed therebetween perpendicular to the slave medium surface. FIG. 15 (A) shows a contact body 1 in which a slave medium and a magnetic transfer master carrier are closely attached.
A pair of electromagnets 82a and 82b having a magnetic field symmetric with respect to the axis of the magnetic pole are arranged on the upper and lower surfaces of the magnetic pole 5 so that the same type of magnetic poles are opposed to each other. As described above, a pair of electromagnets 82a, 8
2b. An example in which the contact body 15 is rotated in such a state is shown, and the DC power supplies 16a, 16b, 16c, and 16d are used to rotate the electromagnet 82, respectively.
DC exciting currents are applied to a, 82b, 82c and 82d.

Since the single electromagnets 82a and 82b are arranged on the upper surface and the lower surface of the contact body 15 with the same poles facing each other, as shown in FIG.
The magnetic field of 2b repels each other, the magnetic field of the electromagnet 82a is directed to the electromagnet 82c of the adjacent pair of electromagnets 82c and 82d, and the magnetic field of the electromagnet 82b is the electromagnet 82d of the adjacent pair of electromagnets. And a magnetic field 9 is applied to the surface of the slave medium 4.

FIG. 15C is a diagram showing the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium has a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium, and rotating the slave medium or rotating the electromagnet causes the slave medium to undergo initial DC magnetization. Can be. The distance between the opposing electromagnets arranged adjacent to each other is set so that the magnetic field formed by the adjacent electromagnets can give the slave medium a magnetic field having an intensity equal to or greater than the coercive force of the slave medium body. Just do it.

FIG. 16 is a diagram for explaining a method of applying a magnetic field using a single transverse electromagnet. FIG. 16 (A)
An electromagnet 82 having a magnetic field symmetric with respect to the axis of the magnetic pole is placed on the upper surface of the contact body 15 in which the slave medium 4 and the master carrier 1 for magnetic transfer are in close contact with each other, with the axis of the magnetic pole arranged parallel to the surface of the slave medium 4. The example which rotates the contact body 15 is shown. From a single electromagnet 82 provided on the upper surface of the contact body 15,
A magnetic field 9 is applied to the surface of the slave medium 4 as shown in FIG. FIG. 16C is a diagram showing the magnetic field intensity given to the slave medium. The magnetic field applied to the slave medium has a peak 10 that is more than 1.5 times the coercive force _Hcs of the slave medium. It can be magnetized.

FIG. 17 is a diagram for explaining a method of applying a magnetic field in which two electromagnets are arranged adjacent to one surface of an adhered body in which a slave medium and a magnetic transfer master carrier are closely adhered. FIG. 17A shows that two electromagnets 82a and 82b are provided on one surface of the contact body 15 so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have the opposite polarity. The axis is arranged perpendicular to the slave medium. An example in which the close contact body 15 is rotated in such a state is shown. As described above, the two electromagnets 82a,
Since the magnetic poles 82b are arranged perpendicular to the slave medium so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have opposite polarities, as shown in FIG. The magnetic field 82a generates a magnetic field directed to another pair of adjacent electromagnets 82b, and the magnetic field 9 is applied to the surface of the slave medium 4. FIG. 17 illustrates an example in which the electromagnet is provided on the upper surface of the close contact body, but may be provided on any side of the close contact body or on both sides. FIG.
(C) is a diagram showing the magnetic field intensity given to the slave medium. The magnetic field applied to the slave medium has a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium, and the slave medium is rotated by rotating the close contact member or by rotating two electromagnets. Can be initially DC-magnetized.

FIG. 18 is a diagram for explaining a method of applying a magnetic field using a ring type head electromagnet. FIG. 18 (A)
An example in which the contact body 15 is rotated with the ring-type head electromagnet 84 arranged on the upper surface of the contact body 15 in which the slave medium and the magnetic transfer master carrier are in close contact with each other is shown. Close contact body 1
5 from the ring-shaped head electromagnet 84 provided on the upper surface of FIG.
A magnetic field 9 is applied to the surface of the slave medium 4 as shown in FIG. FIG. 18C is a diagram illustrating the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium has a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium, and the slave medium is rotated by rotating the close contact member or by rotating the ring type head electromagnet. Can be initially DC-magnetized.
FIG. 18 illustrates an example in which the ring-type head electromagnet is provided on the upper surface of the contact body, but may be provided on any side of the contact body or on both sides.

FIG. 19 is a diagram for explaining a method of applying a magnetic field using an annular electromagnet. An annular electromagnet is formed by winding a coil having a size equivalent to the diameter of a circle on the surface of an annular body such as an annular body formed by rotating a circle around a central axis. The main lines of magnetic force are formed inside the. In the present invention, magnetic lines of force formed outside the annular body are used. The cross section of the coil wound around the surface of the annular body is not limited to a circular shape, but may be a flat circular shape such as an elliptical shape, a rectangular shape, or a circular shape formed at both ends of the rectangular shape. The track surface portion of the annular electromagnet preferably has a flat shape. Further, the distance between the annular electromagnet and the slave medium or the close contact body is preferably as small as possible, and the distance is preferably 0.5 mm to 20 mm.

FIG. 19A shows the close-contact body 15 with the annular electromagnet 85 arranged on the upper surface of the close-contact body 15 in which the slave medium and the magnetic transfer master carrier are in close contact. From the annular electromagnet 85 provided on the upper surface of the contact body 15, FIG.
As shown in (B), the magnetic field 9 leaking from the annular electromagnet is applied to the surface of the slave medium 4 by the coercive force _{Hcs of the} slave medium.
, And an initial DC magnetization of the slave medium can be achieved. Further, in the ring-shaped electromagnet shown in FIG.
~ 24 divided into four parts. Each coil 21-
24 in addition to the means for adjusting the current, etc.
By adjusting 28, the magnetic field intensity given to the slave medium surface can be adjusted. In FIG. 19,
Although the example in which the annular electromagnet is provided on the upper surface of the close contact body has been described, it may be provided on the lower surface side of the close contact body or on both surfaces of the close contact body.

Next, a method of transferring recorded information from the magnetic transfer master carrier to the slave medium will be described. FIG.
FIG. 4 is a diagram illustrating a transfer method and a transfer apparatus in which the axis of a magnetic pole of a single permanent magnet is disposed obliquely to a slave medium surface and a magnetic field is applied. FIG. 20A is a perspective view, and FIG.
(B) shows a cross-sectional view, and FIG. 20 (C) shows a magnetic field applied to the contact body. This is for explaining a method of applying a transfer magnetic field to the surface of the contact body 15 in which the slave medium 4 initially DC-magnetized and the magnetic transfer master carrier 1 are brought into close contact with each other by using the inclined permanent magnet 81. By rotating the contact body 15 in the track direction with respect to its central axis, an asymmetric magnetic field 12 is given to the contact body 15,
A magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization is applied. Among the asymmetrical magnetic fields, the peak 13 having a small intensity has no effect on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and only the peak 14 having a large intensity within the optimum transfer magnetic field intensity range has the magnetic transfer. It will contribute to.

FIG. 21 is a view for explaining a transfer method and a transfer apparatus in which the axes of the magnetic poles of the permanent magnet are arranged obliquely on both surfaces of the slave medium with respect to the slave medium surface and a magnetic field is applied. 21A shows a perspective view, FIG. 21B shows a cross-sectional view, and FIG. 21C shows a magnetic field applied to the contact body. With respect to the surface of the contact body 15 in which the slave medium 4 that has been initially DC magnetized is brought into close contact with the master carrier 1 for magnetic transfer,
The inclined permanent magnets 81a and 81b magnetized symmetrically to the axis of the magnetic pole are made to face each other with the contact body 15 interposed therebetween, and the distance D1 between the permanent magnet ends at one end in the track direction.
Are arranged obliquely so as to be different from the distance D2 between the end portions of the permanent magnets at the other end, so that the magnetic field strength distribution in the track direction is asymmetric, and an asymmetric magnetic field 12 is applied to the surface of the slave medium 4. By rotating the contact body 15 or at least one of the inclined permanent magnets 81a and 81b in the track direction with respect to the center axis of the contact body 15, the magnetization direction of the initial DC magnetization is Are provided with magnetic fields in opposite directions.

Peak 1 of small intensity in asymmetric magnetic field
No. 3 has no effect on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and only the peak 14 having a large intensity contributes to the magnetic transfer. Also,
For the peak 14 having a large intensity, a good pattern can be formed irrespective of the shape of the pattern by applying a magnetic field within the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium.

FIG. 22 is a view for explaining a transfer method and a transfer apparatus in which a single transverse permanent magnet is provided and a magnetic field is applied. FIG. 22A shows a perspective view, FIG. 22B shows a cross-sectional view, and FIG. 22C shows a magnetic field applied to the contact body. A permanent magnet 8 having a magnetic field symmetrical with respect to the axis of the magnetic pole is provided on the upper surface of a contact body 15 in which the slave medium 4 and the master carrier 1 for magnetic transfer are in close contact.
By rotating in the track direction with respect to the center axis of the contact body 15 in a state of being arranged parallel to the surface, a magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization is applied to the entire surface of the contact body 15.

The peak 13 having a small intensity in the applied magnetic field has no influence on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and only the peak 14 having the large intensity contributes to the magnetic transfer. Becomes The peak 14 having a large intensity can form a good pattern irrespective of the shape of the pattern by applying a magnetic field within the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium. FIG. 22 illustrates an example in which the electromagnet is provided on the upper surface of the close contact body, but may be provided on any side of the close contact body or on both sides.

FIG. 23 is a view for explaining a transfer method and a transfer apparatus in which two pairs of permanent magnets are arranged adjacent to each other with the slave medium interposed therebetween perpendicular to the slave medium surface to apply a magnetic field. FIG. 23A shows the upper and lower surfaces of a contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact with each other.
A pair of permanent magnets 8 having a magnetic field symmetric with respect to the axis of the magnetic pole
The magnetic poles a and 8b are arranged with the same type of magnetic poles facing each other, and a pair of permanent magnets 8c and 8d are further disposed so that adjacent magnetic poles have the opposite polarity.
An example in which the close contact body 15 is rotated in such a state is shown.

Since the single permanent magnets 8a and 8b are arranged on the upper and lower surfaces of the close contact member 15 with the same poles facing each other, as shown in FIG.
b repel each other, the magnetic field of the permanent magnet 8a is directed to the permanent magnet 8c of the other pair of adjacent permanent magnets, and the magnetic field of the permanent magnet 8b is set to A magnetic field toward the permanent magnet 8 d is generated, and a magnetic field 9 is applied to the surface of the slave medium 4. Thus, a magnetic field having a magnetic field strength as shown in FIG.

Since the peak 13 having a small intensity in the magnetic field applied to the slave medium is much smaller than the optimum transfer magnetic field intensity range, it has no effect on the transfer of the pattern from the magnetic transfer master carrier to the slave medium. Instead, only the peak 14 having a large intensity contributes to magnetic transfer. Further, by giving a magnetic field included in the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium for the peak 14 having a large intensity, a good pattern can be formed regardless of the shape of the pattern.

FIG. 24 is a view for explaining a transfer method and a transfer apparatus in which two permanent magnets are arranged adjacent to one surface of a close contact body of a slave medium and a magnetic transfer master carrier to apply a magnetic field. It is. FIG. 24A shows two permanent magnets 8a and 8b on one surface of a contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact with each other, that is, adjacent to each other in the direction of the magnetic poles. The axis of each magnetic pole is arranged perpendicular to the slave medium so that the magnetic poles have opposite polarities. In this state, the contact body 1
5 shows an example in which 5 is rotated. As described above, the contact body 15
Two permanent magnets 8a, 8b
The axes of the magnetic poles are arranged perpendicular to the slave medium so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have the opposite polarities. Therefore, as shown in FIG. The magnetic field 8a generates a magnetic field directed to the adjacent pair of permanent magnets 8b, and the magnetic field 9 is applied to the close contact body 15.

FIG. 24C is a diagram showing the magnetic field intensity applied to the slave medium which is in close contact with the magnetic transfer master carrier. Since the peak 13 having a small intensity in the magnetic field applied to the slave medium is much smaller than the optimum transfer magnetic field intensity range, it does not affect the transfer of the pattern from the magnetic transfer master carrier to the slave medium. Only the large peak 14 contributes to magnetic transfer.
Further, by giving a magnetic field included in the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium for the peak 14 having a large intensity, a good pattern can be formed regardless of the shape of the pattern.

FIG. 25 is a view for explaining a transfer method and a transfer apparatus in which the end faces of both magnetic poles of one permanent magnet are arranged facing the slave medium surface and a magnetic field is applied. FIG. 25 (A)
The end faces 8x and 8y of both magnetic poles of the permanent magnet 8 are provided on the upper surface of the contact body 15 between the slave medium and the master carrier for magnetic transfer.
2 shows an example in which the contact body 15 is rotated with a magnetic field applied to the contact body 15. From the end faces 8x and 8y of both magnetic poles of the single permanent magnet 8 provided on the upper surface of the contact body 15, FIG.
As shown in (B), the slave medium or the permanent magnet is rotated in the track direction with respect to the center axis of the slave medium while a magnetic field 9 in the track direction parallel to the slave medium surface is applied. For body 15,
As shown in FIG. 25C, a magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization is applied. The peak 13 having a small intensity in the magnetic field has no influence on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and only the peak 14 having the large intensity contributes to the magnetic transfer. The peak 14 having a large intensity can form a good pattern irrespective of the shape of the pattern by applying a magnetic field within the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium.

FIG. 26 is a view for explaining a transfer method and a transfer apparatus in which an electromagnet is provided on one surface of the close contact member and a magnetic field is applied. FIG. 26A shows an example in which the contact body 15 is rotated in a state in which a magnetic field is applied by the inclined electromagnet 83 to the contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact, and FIG. ) Is a diagram for explaining the magnetic field applied to the contact body, and FIG. 26C is a diagram for explaining the magnetic field intensity applied to the contact body. As shown in FIG. 26A, a single inclined electromagnet 83 provided on the upper surface of the contact body 15
Are supplied with a DC current from a DC power supply 16 and are DC-excited. The axis of the magnetic pole formed by the inclined electromagnet 83 is arranged to be inclined with respect to the close contact body 15.

Then, as shown in FIG. 26 (B), an asymmetric magnetic field 12 is applied to the contact body 15, whereby the inclined electromagnet 83 or the contact body 15 is brought into close contact as shown in FIG. 26 (C). By rotating in the track direction with respect to the center axis of the body, an asymmetric magnetic field can be given, and thus magnetic transfer is performed using the asymmetric magnetic field. Since the peak 13 having a small intensity in the magnetic field applied to the slave medium is smaller than the optimum transfer magnetic field intensity range, it does not affect the transfer of the pattern from the magnetic transfer master carrier to the slave medium at all, and the peak 13 having a large intensity. Only 14 will contribute to magnetic transfer. Also,
As the peak 14 having a large intensity, a good pattern can be formed irrespective of the shape of the pattern by applying a magnetic field included in the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium.

FIG. 27 is a view for explaining a transfer method and a transfer apparatus in which two inclined electromagnets are arranged and a magnetic field is applied. FIG. 27A shows a gradient electromagnet 83 symmetrically magnetized with respect to the axis of the magnetic pole on the upper and lower surfaces of the contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact.
a and 83b are examples in which the slave medium is rotated with the same kind of magnetic poles facing each other.
DC exciting currents are applied to the gradient electromagnets 83a and 83b from the a and 16b.

As shown in FIG. 27 (B), the single inclined electromagnets 83a and 83b are made to face each other with the same poles sandwiching the contact body 15, and the distance D3 between the electromagnet ends at one end in the track direction. Is arranged obliquely so as to be different from the distance D4 between the end portions of the electromagnets at the other end to asymmetrical the magnetic field strength distribution in the track direction. Body 15 or tilted electromagnet 8
By rotating 3a and 83b in the track direction with respect to the center axis of the contact body 15, a magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization is applied to the entire surface of the contact body 15.

As shown in FIG. 27 (C), the peak 13 having a small intensity in the asymmetric magnetic field has no effect on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and the peak 13 having the large intensity. Only 14 will contribute to magnetic transfer. In addition, a peak 14 having a large intensity
By applying a magnetic field within the optimum transfer magnetic field strength range from the magnetic transfer master carrier to the slave medium, a good pattern can be formed regardless of the pattern shape.

FIG. 28 shows a transfer method and a transfer apparatus in which two pairs of electromagnets are arranged adjacent to each other with the slave medium interposed therebetween perpendicularly to the adhered body of the slave medium and the master carrier for magnetic transfer to apply a magnetic field. FIG. FIG. 28 (A)
A pair of electromagnets 82a and 82b having a magnetic field symmetrical with respect to the axis of the magnetic pole are arranged on the upper and lower surfaces of the contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact with the same type of magnetic pole. Further, a pair of electromagnets 82c and 82d are further arranged so that the magnetic poles adjacent to and adjacent to this have the opposite polarity. An example in which the close contact body 15 is rotated in such a state is shown, and a DC exciting current is given to the electromagnets 82a, 82b, 82c, 82d from the DC power supplies 16a, 16b, 16c, 16d, respectively.

Since the single electromagnets 82a and 82b are arranged on the upper surface and the lower surface of the contact body 15 with the same poles facing each other, as shown in FIG.
The magnetic field of 2b repels each other, the magnetic field of electromagnet 82a goes to electromagnet 82c of another pair of adjacent electromagnets, and the magnetic field of electromagnet 82b goes to electromagnet 82d of another pair of adjacent electromagnets. A magnetic field is generated, and a magnetic field 9 in a direction opposite to the initial DC magnetization direction is applied to the contact body 15.

FIG. 28C is a diagram showing the strength of the magnetic field applied to the close contact body between the slave medium and the master carrier for magnetic transfer. Since the peak 13 having a small intensity in the magnetic field applied to the close contact body is much smaller than the optimum transfer magnetic field intensity range, it does not affect the transfer of the pattern from the magnetic transfer master carrier to the slave medium. Only the peak 14 having a large value contributes to magnetic transfer. Further, by giving a magnetic field included in the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium for the peak 14 having a large intensity, a good pattern can be formed regardless of the shape of the pattern.

FIG. 29 is a view for explaining a transfer method and a transfer apparatus for applying a magnetic field using a single transverse electromagnet. FIG. 29A shows an electromagnet 82 having a magnetic field symmetrical with respect to the axis of the magnetic pole, and an electromagnet 82 having a magnetic field symmetric with respect to the axis of the magnetic pole. FIG. 29B shows an example in which the close contact body 15 is rotated in a state where the contact body 15 is arranged in parallel with the surface of the slave medium 4 as shown in FIG. Then, as shown in FIG. 29C, at least one of the contact body 15 and the electromagnet 82 is rotated in the track direction with respect to the center axis of the contact body 15, so that the contact body 15 or the electromagnet 82 is rotated.
Is applied with a magnetic field in the direction opposite to the magnetization direction of the initial DC magnetization.

The peak 13 having a small intensity in the applied magnetic field has no effect on the transfer of the pattern from the magnetic transfer master carrier to the slave medium, and only the peak 14 having a large intensity contributes to the magnetic transfer. Becomes The peak 14 having a large intensity can form a good pattern irrespective of the shape of the pattern by applying a magnetic field within the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium.

FIG. 30 is a view for explaining a transfer method and a transfer apparatus in which two electromagnets are arranged adjacent to one surface of a contact body and a magnetic field is applied. FIG. 30 (A) shows a contact body 1 in which a slave medium 4 and a magnetic transfer master carrier 1 are closely attached.
5, one of the two electromagnets 82a and 82b is connected to the slave medium 4 so that the axes of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have the opposite polarity.
Are arranged vertically. An example in which the close contact body 15 is rotated in such a state is shown. As described above, at least one of the two electromagnets 8
Since the poles of 2a and 82b are arranged perpendicular to the slave medium so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have opposite polarities, FIG.
As shown in (B), the magnetic field of the electromagnet 82a generates a magnetic field directed to the adjacent pair of electromagnets 82b, and
A magnetic field 9 is applied to 5.

FIG. 30C is a diagram showing the strength of the magnetic field applied to the contact body. Since the peak 13 having a small intensity in the magnetic field applied to the slave medium is much smaller than the optimum transfer magnetic field intensity range, it does not affect the transfer of the pattern from the magnetic transfer master carrier to the slave medium. Only the large peak 14 contributes to magnetic transfer. Further, by giving a magnetic field included in the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium for the peak 14 having a large intensity, a good pattern can be formed regardless of the shape of the pattern.

FIG. 31 is a view for explaining a transfer method and a transfer apparatus in which a ring-type head electromagnet is provided and a magnetic field is applied. FIG. 31A shows an example in which the contact body 15 is rotated with the ring-type head electromagnet 84 arranged on the upper surface of the contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact. A magnetic field 9 is applied to the surface of the slave medium 4 from the ring-type head electromagnet 84 provided on the upper surface of the contact body 15 as shown in FIG. FIG.
FIG. 31C is a diagram illustrating the strength of the magnetic field given by the application of the magnetic field in FIG. A ring-shaped head electromagnet 84 is provided for the contact body 15 in which the slave medium 4 is in close contact with the magnetic transfer master carrier 1, and at least one of the contact body 15 and the ring-type head electromagnet 82 is connected to the center axis of the contact body 15. , A magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization is applied to the entire surface of the contact body 15.

The peak 13 having a small intensity in the applied magnetic field has no influence on the transfer of the pattern from the master carrier for magnetic transfer to the slave medium, and only the peak 14 having a large intensity contributes to the magnetic transfer. Becomes The peak 14 having a large intensity can form a good pattern irrespective of the shape of the pattern by applying a magnetic field within the optimum transfer magnetic field intensity range from the magnetic transfer master carrier to the slave medium. In FIG. 31, the example in which the ring-type head electromagnet is provided on the upper surface of the close contact body is described.

FIG. 32 is a view for explaining a transfer method and a transfer apparatus in which a ring-shaped electromagnet is provided and a magnetic field is applied. FIG.
FIG. 2A shows a state in which the annular electromagnet 85 is disposed on the upper surface of the contact body 15. From the annular electromagnet 85 provided on the upper surface of the contact body 15, as shown in FIG.
5, a magnetic field 9 leaking from the annular electromagnet applies a magnetic field in a direction opposite to the magnetization direction of the initial DC magnetization to the entire surface of the contact body 15. As a result, the recording information is transferred from the magnetic transfer master carrier 1 to the slave medium. The strength of the magnetic field given to the contact body from the annular electromagnet is
It can be adjusted by changing the intensity of the current flowing through the ring-shaped electromagnet and the distance between the ring-shaped electromagnet and the slave medium surface.

FIG. 32C is a diagram for explaining another annular electromagnet. The annular electromagnet shown in FIG. 32 (C) is one in which a coil constituting the annular electromagnet is divided into four coils 21 to 24. By adjusting the gaps 25 to 28 between the coils in addition to the means for adjusting the current of each of the coils 21 to 24, the magnetic field intensity given to the slave medium surface can be adjusted. Further, in FIG. 32, the example in which the annular electromagnet is provided on the upper surface of the close contact body has been described.

2, 3, 6, 8, 9, 11, 1
In the devices shown in 2, 16 to 20, 22, 24 to 26, and 29 to 32, a mechanism capable of arbitrarily adjusting the distance between the slave medium surface and the magnet is provided.
The devices shown in FIGS. 7, 13 to 15, 21, 23, 27, and 28 are provided with a mechanism capable of arbitrarily adjusting the distance between opposing magnets.
In the devices shown in 3, 24, 28 and 30, a mechanism capable of arbitrarily adjusting the distance between the parallel magnets is provided, and shown in FIGS. 3, 5, 12, 14, 20, 21, 26 and 27. The apparatus is provided with a mechanism capable of arbitrarily adjusting the angle of the magnet with respect to the slave medium surface.
The devices 9 and 26 to 32 are provided with a mechanism capable of arbitrarily adjusting the direction and value of the current for exciting the electromagnet. Then, a desired magnetic field strength can be obtained on the slave medium surface by adjusting these distances, angles, energizing directions, current values, and the like to predetermined sizes.

FIGS. 3, 5, 12, 14, 21, and 2
The devices shown in FIGS. 6 and 27 merely show a basic method for asymmetry of the magnetic field intensity distribution at the circumferential position using one magnet, and the shape of the magnet on the slave medium surface side is used. Asymmetrical magnetic field strength distribution can also be obtained by changing the size of the magnet, by combining a plurality of small magnets into one magnet, or by making the material used for the magnet non-uniform and thus asymmetric. Can be obtained.
Next, in the present invention, after initial DC magnetization in a state where the master carrier for magnetic transfer and the slave medium are in close contact with each other,
A magnetic transfer method for immediately applying a magnetic transfer magnetic field to perform magnetic transfer will be described. FIG. 33 is a diagram for explaining the application of a magnetic field to the close contact body between the disk-shaped slave medium and the master carrier for magnetic transfer. FIG. 33 (A) shows a state in which a magnetic field having a large intensity for initial DC magnetization and a transfer magnetic field are applied from a magnetic field generating means fixed while rotating a close contact body between a slave medium and a master carrier for magnetic transfer. For the contact body 15 between the slave medium and the master carrier for magnetic transfer,
A magnetic field for initial DC magnetization is applied at a magnetic field position P1 for initial DC magnetization, and immediately after that, a magnetic field for magnetic transfer is applied to a region subjected to initial DC magnetization at a magnetic field position P2 for magnetic transfer.

FIG. 33 (B) shows a state in which the contact body has made one round. However, even after one round, the initial DC magnetization region U existing between the initial DC magnetization magnetic field position P1 and the magnetic transfer magnetic field position P2 at the start of the initial DC magnetization is obtained.
No magnetic transfer was performed. On the other hand, when the rotation is further performed to apply the transfer magnetic field to the initial DC magnetization region U, the region to which the transfer magnetic field is applied is subjected to the initial DC magnetization again to form a re-initial DC magnetization region R.
If there is no transfer pattern of recorded information in the area where re-initial DC magnetization is performed, it does not matter if the initial DC magnetization is repeated, but there is a transfer pattern of recorded information in the area where re-initial DC magnetization is performed. In this case, the magnetic transfer pattern of the recorded information is not correctly formed.

Therefore, in such a case, after the initial DC magnetization magnetic field and the transfer magnetic field are applied at least once, the rotation is stopped, and then the magnetic field strength at the contact surface is 1 _% of the coercive force _Hcs of the slave medium. The distance between the magnetic field generating means and the close contact body is increased until the magnetic field does not affect the slave medium until the magnetic field no longer affects the slave medium. In the state where the magnetic field at the optimum transfer strength is obtained, a magnetic field is applied in the track direction of the close contact body to perform the transfer, and a transfer magnetic field is applied to the entire surface to perform the magnetic transfer completely. The transfer can be completed by removing the slave medium from the close contact body while keeping the distance between the close contact body and the magnetic field generating means large so that the coercive force _Hcs of the slave medium is less than 1/2.

A method for applying a magnetic field for initial DC magnetization and a magnetic field for transfer to the slave medium by a permanent magnet will be described below. FIG. 34 is a diagram illustrating a method of applying a magnetic field using a single inclined permanent magnet. FIG. 34 (A)
FIG. 34 is a perspective view for explaining application of an asymmetric magnetic field, and FIG.
34B is a cross-sectional view illustrating a magnetic field provided by application of the magnetic field in FIG. The magnetic field generating means is formed of a tilted permanent magnet 81, and the asymmetric magnetic field 1
2 and rotating the contact body 15 or the inclined permanent magnet 81 in the track direction with respect to the center axis of the contact body, the coercive force H of the slave medium applied to the contact body 15 is given.
Immediately after the peak 10 having a magnitude of 1.5 times or more of _{cs exerts} the action of the initial DC magnetization, an optimum transfer strength peak 11a within the optimum transfer magnetic field strength range is given to complete the initial DC magnetization after one rotation or more. And simultaneously applying a magnetic field having an optimum transfer intensity peak 11a in the opposite direction to perform complete magnetic transfer of recorded information.

Depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and the transfer magnetic field is subsequently applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. When the magnetic transfer is performed by applying one or more rotations to perform the initial DC magnetization, and simultaneously applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet and performing the magnetic transfer, Is stopped and the distance between the magnet and the close contact body is increased until the magnetic field strength on the slave medium surface becomes less than 1/2 of the coercive force _Hcs of the slave medium and the magnetic field does not affect the slave medium. As shown in FIG. 34 (D), a magnet having a polarity opposite to that of the magnetic field to which the initial DC magnetization was applied was arranged so that the distance to the close contact body was larger than that in the initial DC magnetization, and the magnetic field on the slave medium surface was increased. Is shown in FIG. ) Optimum transfer intensity peak at 11
After a magnetic field is applied in the track direction of the close contact body to perform complete magnetic transfer over the entire surface in a state where the strength is indicated by b, the magnetic field strength on the slave medium surface again becomes one of the coercive force _Hcs of the slave medium. The transfer can be completed by removing the slave medium from the close contact body in a state where the distance between the close contact body and the magnet is increased so as to be less than / 2.

FIG. 35 is a diagram for explaining a method of applying a magnetic field using two inclined permanent magnets. FIG. 35 (A) is a diagram for explaining a method of applying two asymmetrical permanent magnets on the slave medium surface and applying an asymmetric magnetic field, and FIG. 35 (B).
FIG. 3 is a diagram illustrating a magnetic field applied to a slave medium surface. Single tilted permanent magnet 8 magnetized symmetrically to the axis of the pole
1a and 81b are attached to the upper and lower surfaces of the contact body 15 between the slave medium 4 and the master carrier 1 for magnetic transfer.
5, and are arranged obliquely such that the distance D1 between the permanent magnet ends at one end in the track direction is different from the distance D2 between the permanent magnet ends at the other end. This is an asymmetrical magnetic field strength distribution in the track direction. By applying an asymmetrical magnetic field 12 to the surface of the slave medium 4,
Close contact body 15 or inclined permanent magnets 81a and 81b
Is rotated in the track direction with respect to the center axis of the close contact member 15, whereby an asymmetric magnetic field is applied to the entire surface of the slave medium to make one rotation to perform initial DC magnetization, and at the same time, in the opposite direction from the same magnet. Fig. 35
(C) gives the optimum transfer intensity peak 11a and completes the initial DC magnetization by making one or more rotations, and simultaneously applies a magnetic field of the optimum transfer intensity peak 11a in the opposite direction to record the recorded information. Complete magnetic transfer is performed.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. When the magnetic transfer is performed by applying one or more rotations to perform the initial DC magnetization, and simultaneously applying the magnetic field of the optimal transfer intensity peak 11a, which is a magnetic field in the opposite direction from the same magnet, and then performing the magnetic transfer, Is stopped and the distance between the magnet and the close contact body is increased until the magnetic field strength on the slave medium surface becomes less than 1/2 of the coercive force _Hcs of the slave medium and the magnetic field does not affect the slave medium. As shown in FIG. 35 (D), a magnet having a polarity opposite to that of the magnetic field to which the initial DC magnetization was applied was arranged so that the distance to the close contact body was larger than that at the time of the initial DC magnetization, and the magnetic field at the slave medium surface was increased. Is shown in FIG. ) Optimum transfer intensity peak at 11
After a magnetic field is applied in the track direction of the close contact body to perform complete magnetic transfer over the entire surface in a state where the strength is indicated by b, the magnetic field strength on the slave medium surface again becomes one of the coercive force _Hcs of the slave medium. The transfer can be completed by removing the slave medium from the close contact body in a state where the distance between the close contact body and the magnet is increased so as to be less than / 2.

The optimum value of the inclination of the axis of the magnetic pole changes depending on the shape of the magnet.
It is preferable that the angle be in the range of ° to 70 °, more preferably in the range of 20 ° to 55 °.

FIG. 36 is a diagram for explaining a method of applying a magnetic field using a horizontal permanent magnet. FIG. 36 (A) shows a close contact body 15 between the slave medium 4 and the magnetic transfer master carrier 1.
An example in which a permanent magnet 8 having a magnetic field symmetrical with respect to the axis of a magnetic pole is rotated on the upper surface of the contact medium 15 with the axis of the magnetic pole arranged in parallel with the surface of the slave medium 4 is shown. Close contact body 1
36 (B) from the single permanent magnet 8 provided on the upper surface of FIG.
A magnetic field 9 is applied to the surface of the slave medium 4 as shown in FIG. FIG. 36C is a diagram illustrating the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium, immediately after the large peak 10 of the intensity exceeding 1.5 times the coercive force H _CS of the slave medium was the effect of the initial DC magnetization, the optimal transfer magnetic field intensity range from one magnet Of the optimum transfer intensity peak 11a to complete the initial DC magnetization by one or more rotations, and at the same time, apply a magnetic field of the optimum transfer intensity peak 11a in the opposite direction to complete magnetic transfer of the recorded information. Is what you do.

Further, depending on the pattern of the recording information for transfer, the initial DC magnetization is completely performed, and when the magnetic field for transfer is subsequently applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimum transfer intensity peak 11a which is the opposite magnetic field from the same magnet. After stopping and increasing the distance between the magnet and the close contact body until the magnetic field strength on the slave medium surface becomes less than half of the coercive force _Hcs of the slave medium and the magnetic field does not affect the slave medium, FIG. As shown in FIG. 36 (D), a magnet having a polarity opposite to that of the magnetic field having the initial DC magnetization is provided so that the distance from the contact body is larger than that at the time of the initial DC magnetization. FIG. 36 (C Optimum transfer intensity peak 11b in
After applying a magnetic field in the track direction of the close-contact body to complete magnetic transfer on the entire surface in a state where the strength is represented by, the magnetic field strength on the slave medium surface is again _1/1 / _Hcs of the coercive force _Hcs of the slave medium. The transfer can be completed by removing the slave medium from the contact body in a state where the distance between the contact body and the magnet is increased so that the distance is less than 2.

FIG. 37 shows a magnetic field generated by using a permanent magnet in which two pairs of magnets are arranged adjacent to each other with a close contact between the slave medium and the master carrier for magnetic transfer perpendicular to the surface of the slave medium. It is a figure explaining an application method. FIG. 37 (A)
A pair of permanent magnets 8a and 8b having a magnetic field symmetric with respect to the axis of the magnetic pole are disposed on the upper and lower surfaces of the close contact body 15 between the slave medium 4 and the master carrier 1 for magnetic transfer so that the same type of magnetic poles are opposed to each other. Further, a pair of permanent magnets 8 are further arranged so that adjacent magnetic poles adjacent thereto have the opposite polarity.
c and 8d are arranged. An example in which the close contact body 15 is rotated in such a state is shown. Close contact body 1
Since the single permanent magnets 8a and 8b are arranged with the same poles facing each other on the upper surface and the lower surface of 5, the magnetic fields of 8a and 8b repel each other as shown in FIG. The magnetic field 8a is directed to the permanent magnet 8c of the adjacent pair of permanent magnets, and the magnetic field of the permanent magnet 8b is directed to the permanent magnet 8d of the adjacent pair of permanent magnets. A magnetic field 9 is applied to the surface 4.

FIG. 37C is a diagram showing the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium, immediately after the large peak 10 of the intensity exceeding 1.5 times the coercive force H _CS of the slave medium was the effect of the initial DC magnetization, the optimal transfer intensity within the optimal transfer magnetic field intensity range In addition to performing one or more rotations to give the peak 11a, complete initial DC magnetization is performed, and at the same time, complete magnetic transfer of recorded information is performed by applying a magnetic field of an optimal transfer strength peak 11a in the opposite direction. .

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. When the magnetic transfer is performed by applying one or more rotations to perform the initial DC magnetization, and simultaneously applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet and performing the magnetic transfer, Is stopped and the distance between the magnet and the close contact body is increased until the magnetic field strength on the slave medium surface becomes less than 1/2 of the coercive force _Hcs of the slave medium and the magnetic field does not affect the slave medium. As shown in FIG. 37 (D), a magnet having a polarity opposite to that of the magnetic field to which the initial DC magnetization was applied was provided so that the distance to the close contact body was larger than that in the initial DC magnetization, and the magnetic field on the slave medium surface was changed. Is shown in FIG. ) Optimum transfer intensity peak at 11
After a magnetic field is applied in the track direction of the close contact body to perform complete magnetic transfer over the entire surface in a state where the strength is indicated by b, the magnetic field strength on the slave medium surface again becomes one of the coercive force _Hcs of the slave medium. The transfer can be completed by removing the slave medium from the close contact body in a state where the distance between the close contact body and the magnet is increased so as to be less than / 2. This is to transfer the initial DC magnetization of the slave medium and the recorded information.

FIG. 38 is a view for explaining a method of applying a magnetic field in which two permanent magnets are arranged adjacent to one surface of a close contact body between a slave medium and a master carrier for magnetic transfer. FIG. 38A shows that two permanent magnets 8a and 8b are provided on one surface of the contact body 15 so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have the opposite polarity. Are arranged perpendicular to the contact body 15. An example in which the close contact body 15 is rotated in such a state is shown. On one surface of the contact body 15, two permanent magnets 8a,
38b, the axes of the respective magnetic poles are arranged perpendicular to the slave medium so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have opposite polarities. Therefore, as shown in FIG. The magnetic field of the magnet 8a generates a magnetic field directed to the adjacent pair of permanent magnets 8b, and the magnetic field 9 is applied to the surface of the slave medium 4.

FIG. 38C shows the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium, immediately after the large peak 10 of the intensity exceeding 1.5 times the coercive force H _CS of the slave medium was the effect of the initial DC magnetization, the optimal transfer intensity within the optimal transfer magnetic field intensity range In addition to performing one or more rotations to give the peak 11a, complete initial DC magnetization is performed, and at the same time, complete magnetic transfer of recorded information is performed by applying a magnetic field of an optimal transfer strength peak 11a in the opposite direction. .

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. When the magnetic transfer is performed by applying one or more rotations to perform the initial DC magnetization, and simultaneously applying the magnetic field of the optimal transfer intensity peak 11a, which is a magnetic field in the opposite direction from the same magnet, and then performing the magnetic transfer, Is stopped and the distance between the magnet and the close contact body is increased until the magnetic field strength on the slave medium surface becomes less than 1/2 of the coercive force _Hcs of the slave medium and the magnetic field does not affect the slave medium. As shown in FIG. 38 (D), a magnet having a polarity opposite to that of the magnetic field to which the initial DC magnetization is applied is provided so that the distance between the magnet and the close contact body is larger than that at the time of the initial DC magnetization. Is shown in FIG. ) Optimum transfer intensity peak at 11
After a magnetic field is applied in the track direction of the close contact body to perform complete magnetic transfer over the entire surface in a state where the strength is indicated by b, the magnetic field strength on the slave medium surface again becomes one of the coercive force _Hcs of the slave medium. The transfer can be completed by removing the slave medium from the close contact body in a state where the distance between the close contact body and the magnet is increased so as to be less than / 2.

FIG. 39 is a view for explaining a method of applying a magnetic field arranged on the contact body surface with the end faces of both magnetic poles of one permanent magnet facing the contact body surface. FIG. 39 (A) shows the slave medium 4
An example is shown in which, on the upper surface side of the contact body 15 between the magnetic transfer master carrier 1 and the end faces 8x and 8y of the two magnetic poles of the permanent magnet 8, a magnetic field is applied to the contact body 15 with the magnetic field applied. I have. A state in which a parallel track direction magnetic field 9 is applied to the slave medium surface from the end surfaces 8x and 8y of both magnetic poles of the single permanent magnet 8 provided on the upper surface of the contact body 15 as shown in FIG. Thus, the contact member 15 or the permanent magnet is rotated in the track direction with respect to the center axis of the contact member. In the example shown in FIG. 39, one permanent magnet is provided on the upper surface of the slave medium. However, the permanent magnet may be provided on the lower surface or on both surfaces.

FIG. 39C is a diagram showing the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium, immediately after the large peak 10 of the intensity exceeding 1.5 times the coercive force H _CS of the slave medium was the effect of the initial DC magnetization, the optimal transfer magnetic field intensity range from one magnet Of the optimum transfer intensity peak 11a to complete the initial DC magnetization by one or more rotations, and at the same time, apply a magnetic field of the optimum transfer intensity peak 11a in the opposite direction to complete magnetic transfer of the recorded information. Is what you do.

Further, depending on the pattern of the recording information for transfer, the initial DC magnetization is completely performed, and when the magnetic field for transfer is subsequently applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the rotation is stopped after the magnetic transfer is performed by applying the magnetic field of the optimum transfer intensity peak 11a in the opposite direction while applying the magnetic field in the opposite direction at the same time as applying the rotation for one or more rotations. The magnetic field strength at the medium surface is 1 / coercive force _Hcs of the slave medium.
After increasing the distance between the magnet and the close contact member until the magnetic field becomes less than 2 and the magnetic field does not affect the slave medium, FIG.
As shown in (D), a magnet having a polarity opposite to that of the magnetic field to which the initial DC magnetization is applied is arranged so that the distance between the magnet and the close contact body is larger than that at the time of the initial DC magnetization. 39
In (C), a magnetic field is applied in the track direction of the close contact body to perform complete magnetic transfer on the entire surface in a state where the intensity is indicated by the optimum transfer intensity peak 11b, and then the magnetic field intensity on the slave medium surface is again changed to the slave. 1/2 of the coercive force _Hcs of the medium
The transfer can be completed by removing the slave medium from the close contact body in a state where the distance between the close contact body and the magnet is increased so that the distance is less than the above.

The magnet used to apply a magnetic field with the end faces of both magnetic poles facing the contact surface can be a U-shaped, horseshoe-shaped, arc-shaped, elliptical-arc-shaped magnet, etc. Permanent magnets whose axes are not parallel but intersecting may be used. The end faces of the magnetic poles are not limited to those parallel to the slave medium surface, but may be inclined. They are also shown in FIG. Similarly, when the magnetic field to be applied to the slave medium surface is given by an electromagnet instead of a permanent magnet, the initial DC magnetization and the transfer magnetic field are simultaneously generated, and one rotation is performed. It can be performed.

In the case where complete transfer is not performed in the one-turn processing operation, or when the transferred portion is further subjected to initial DC magnetization, (1) rotate one or more turns to apply an initial DC magnetic field. Immediately after the transfer, a transfer magnetic field is applied and then the rotation is stopped. (2) The current supplied to the electromagnet was stopped, and after eliminating the magnetic field of the electromagnet, a current in the opposite direction was supplied so that the maximum magnetic field had an optimum transfer magnetic field strength, and the transfer magnetic field was applied to rotate. Later, after the current supply to the electromagnet is stopped again, the adhered body is removed. With this process, the initial DC magnetization of the slave medium and the subsequent magnetic transfer can be completed in any transfer pattern.

Hereinafter, a method of applying a magnetic field by an electromagnet will be described. FIG. 40 shows that one surface of
It is a figure explaining the method of arranging a single inclined electromagnet and applying a magnetic field. FIG. 40A shows an example in which the contact body 15 is rotated in a state where a magnetic field is applied by the inclined electromagnet 83 to the contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact. () Is a diagram for explaining the magnetic field applied to the contact body. As shown in FIG. 40 (A), a single gradient electromagnet 83 provided on the upper surface of the contact body 15 is supplied with a DC current from the DC power supply 16 and is DC-excited. The pole of the magnetic pole is the contact body 15
It is arranged to be inclined with respect to.

Then, as shown in FIG. 40 (B), an asymmetric magnetic field 12 is applied to the contact body 15. As a result, a magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to the slave medium, and immediately after the initial DC magnetization is performed, the optimum transfer magnetic field intensity range from the same electromagnet is obtained. And the initial transfer magnetization is completely performed by giving the optimum transfer intensity peak 11a within 1 rotation or more.
At the same time, the optimum transfer strength peak 11
A magnetic transfer of recorded information is performed completely by applying the magnetic field a.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all the surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet. At the same time, the energization is stopped, and then FIG.
As shown in FIG. 40, the energizing direction is reversed, and a magnetic field is applied in the track direction of the close contact body in a state where the maximum magnetic field strength on the slave medium surface becomes the strength indicated by the optimum transfer strength peak 11b in FIG. After the complete magnetic transfer is performed on the entire surface, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field.

FIG. 41 is a diagram for explaining a method of applying a magnetic field using a pair of inclined electromagnets. FIG. 41A shows a state in which inclined electromagnets 83a and 83b are arranged on both surfaces of the close contact body 15 in which the slave medium 4 and the magnetic transfer master carrier 1 are in close contact with each other, and the close contact body 15 is rotated in a state where a magnetic field is applied. FIG. 41B is a diagram for explaining an example of the magnetic field applied to the slave medium. Both electromagnets are inclined with different distances D3 and D4 between the electromagnet end portions. The body 15 is provided with an asymmetric magnetic field 12.

As shown in FIG. 41 (C), the slave medium is given a magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium. Immediately after the initial DC magnetization is performed, the optimum transfer intensity peak 11a within the optimum transfer magnetic field intensity range is given to perform one or more rotations to completely perform the initial DC magnetization, and at the same time, when the magnetic field in the opposite direction is The magnetic field at the peak 11a is applied to perform complete magnetic transfer of the recorded information.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed, and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet. At the same time, the energization is stopped, and then FIG.
As shown in (1), the magnetic field is applied in the track direction of the close contact body while the direction of the current is reversed, and the maximum magnetic field intensity on the slave medium surface becomes the intensity indicated by the optimum transfer intensity peak 11b in FIG. After the complete magnetic transfer of the entire surface is performed, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field.

FIG. 42 is a diagram for explaining a method of applying a magnetic field in which two pairs of electromagnets are arranged adjacent to each other with a close contact member perpendicular to the slave medium surface. FIG. 42 (A) shows a pair of electromagnets 82a and 82b having a magnetic field symmetrical with respect to the axis of the magnetic pole on the upper and lower surfaces of the contact body 15 in which the slave medium and the magnetic transfer master carrier are in close contact with each other. And a pair of electromagnets 82c and 82d are further arranged such that adjacent magnetic poles have opposite polarities. An example in which the close contact body 15 is rotated in such a state is shown.
6a, 16b, 16c, 16d to electromagnets 82a, 82
DC exciting currents are given to b, 82c and 82d.

Since the single electromagnets 82a and 82b are arranged on the upper and lower surfaces of the close contact body 15 with the same poles facing each other, as shown in FIG.
The magnetic field of 2b repels each other, the magnetic field of the electromagnet 82a is directed to the electromagnet 82c of the adjacent pair of electromagnets 82c and 82d, and the magnetic field of the electromagnet 82b is the electromagnet 82d of the adjacent pair of electromagnets. And a magnetic field 9 is applied to the surface of the slave medium 4. FIG. 42C is a diagram illustrating the magnetic field strength distribution at this time.

A magnetic field 9 is applied to the contact body 15 between the slave medium and the magnetic transfer master carrier. As a result, a magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to the slave medium, and immediately after the initial DC magnetization is performed, the optimum transfer within the optimum transfer magnetic field intensity range is performed. A complete initial DC magnetization is performed by giving an intensity peak 11a and making one or more rotations, and at the same time, a magnetic field of the optimal transfer intensity peak 11a is applied in the opposite direction to complete magnetic transfer of recorded information. is there.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet. At the same time, the power supply is stopped, and then, as shown in FIG.
As shown in Fig. 42, the energizing direction is reversed, and a magnetic field is applied in the track direction of the close contact body while the maximum magnetic field intensity on the slave medium surface is the intensity indicated by the optimum transfer intensity peak 11b in Fig. 42C. After the complete magnetic transfer of the entire surface is performed, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field. The distance between the opposing electromagnets arranged adjacent to each other is such that the magnetic field formed by the adjacent electromagnets gives the slave carrier a magnetic field of an intensity for initial DC magnetization or a magnetic field of an intensity within the optimum transfer intensity range. May be arranged at a possible distance.

FIG. 43 is a diagram for explaining a method of applying a magnetic field using a single transverse electromagnet. FIG. 43 (A)
An electromagnet 82 having a magnetic field symmetric with respect to the axis of the magnetic pole is placed on the upper surface of the contact body 15 in which the slave medium 4 and the master carrier 1 for magnetic transfer are in close contact with each other, with the axis of the magnetic pole arranged parallel to the surface of the slave medium 4. The example which rotates the contact body 15 is shown. From a single electromagnet 82 provided on the upper surface of the contact body 15,
As shown in FIG. 43B, a magnetic field 9 is applied to the surface of the slave medium 4. FIG. 43 (C) is a diagram illustrating the magnetic field strength distribution at this time.

A magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to the slave medium with respect to the adhered body 15 between the slave medium and the master carrier for magnetic transfer. Immediately after the magnetization is performed, one electromagnet gives the optimum transfer strength peak 11a within the optimum transfer magnetic field strength range and performs one or more rotations to perform the complete initial DC magnetization, and at the same time, the magnetic field in the opposite direction is optimal. A magnetic field having a transfer intensity peak 11a is applied to perform complete magnetic transfer of recorded information.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet. At the same time, the energization is stopped, and then, as shown in FIG.
As shown in (c), the energizing direction is reversed, and a magnetic field is applied in the track direction of the close contact body in a state where the maximum magnetic field intensity on the slave medium surface becomes the intensity indicated by the optimum transfer intensity peak 11b in FIG. After the complete magnetic transfer of the entire surface is performed, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field.

FIG. 44 is a diagram for explaining a method of applying a magnetic field in which two electromagnets are arranged adjacent to one surface of a contact body in which a slave medium and a magnetic transfer master carrier are closely attached. FIG. 44A shows that two electromagnets 82a and 82b are provided on one surface of the contact body 15 so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have the opposite polarity. The axis is arranged perpendicular to the slave medium. An example in which the close contact body 15 is rotated in such a state is shown. As described above, the two electromagnets 82a,
Since the magnetic poles 82b are arranged perpendicular to the slave medium so that the directions of the magnetic poles are opposite to each other, that is, the adjacent magnetic poles have opposite polarities, as shown in FIG. The magnetic field 82a generates a magnetic field directed to another pair of adjacent electromagnets 82b, and the magnetic field 9 is applied to the surface of the slave medium 4. A magnetic field 9 is applied from a single electromagnet 82 provided on the upper surface of the contact body 15 to the surface of the slave medium 4 as shown in FIG. FIG. 44C is a diagram illustrating the magnetic field strength distribution at this time.

A magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to the slave medium with respect to the adhered body between the slave medium and the master carrier for magnetic transfer. Immediately after the transfer, the optimum transfer intensity peak 11a within the optimum transfer magnetic field intensity range from the electromagnet is obtained.
To perform complete initial DC magnetization with one or more rotations, and at the same time, apply a magnetic field in the opposite direction, which is the optimum transfer intensity peak 11a, to perform complete magnetic transfer of recorded information.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and the magnetic field for transfer is subsequently applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimum transfer intensity peak 11a which is the opposite magnetic field from the same magnet. At the same time, the energization is stopped, and then FIG.
As shown in (a), the energizing direction is reversed, and a magnetic field is applied in the track direction of the close contact body in a state where the maximum magnetic field strength on the slave medium surface becomes the strength indicated by the optimum transfer strength peak 11b in FIG. After the complete magnetic transfer of the entire surface is performed, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field.

FIG. 45 is a diagram for explaining a method of applying a magnetic field using a ring-type head electromagnet. FIG. 45 (A)
An example in which the contact body 15 is rotated with the ring-type head electromagnet 84 arranged on the upper surface of the contact body 15 in which the slave medium and the magnetic transfer master carrier are in close contact with each other is shown. Close contact body 1
5 from the ring-shaped head electromagnet 84 provided on the upper surface of FIG.
A magnetic field 9 is applied to the surface of the slave medium 4 as shown in FIG. FIG. 45C is a diagram illustrating the magnetic field intensity applied to the slave medium. The magnetic field applied to the slave medium has a peak 10 that exceeds 1.5 times the coercive force _Hcs of the slave medium. Initial DC magnetization can be performed. Further, in FIG. 45, an example is described in which the ring-type head electromagnet is provided on the upper surface of the close-contact body.

Then, a magnetic field having a peak 10 exceeding 1.5 times the coercive force _Hcs of the slave medium is applied to the slave medium with respect to the adhered body between the slave medium and the master carrier for magnetic transfer. Immediately after DC magnetization is performed,
One electromagnet gives an optimum transfer strength peak 11a within the optimum transfer magnetic field strength range and performs one or more rotations to completely perform initial DC magnetization, and simultaneously applies a magnetic field in the opposite direction and having the optimum transfer strength peak 11a. Thus, complete magnetic transfer of recorded information is performed.

Further, depending on the pattern of the recording information for transfer, if the initial DC magnetization is completely performed and further the transfer magnetic field is applied to all surfaces, the initial DC magnetization is performed again and the magnetic transfer pattern is lost. In this case, the initial DC magnetization is performed by applying one or more rotations, and at the same time, the rotation is performed after the magnetic transfer is performed by applying the magnetic field of the optimal transfer intensity peak 11a in the opposite direction from the same magnet. At the same time, the energization is stopped, and then FIG.
As shown in FIG. 45, the energization direction is reversed, and a magnetic field is applied in the track direction of the close contact body in a state where the maximum magnetic field strength on the slave medium surface has the strength indicated by the optimum transfer strength peak 11b in FIG. After the complete magnetic transfer is performed on the entire surface, the magnetic transfer from the magnetic transfer master carrier to the slave medium can be performed by stopping the supply of the current for applying the magnetic field.

The permanent magnet may be a permanent magnet such as an alloy steel or a rare earth-based permanent magnet. As the electromagnet, even in the case of an air-core type solenoid coil, soft iron, silicon steel, permalloy, and high magnetic permeability ferrite are provided at the center of the coil. Any of those having a core made of, for example, can be used. For ring-type head electromagnets, core materials include soft iron, silicon steel,
Permalloy, high-permeability ferrite, or the like can be used. The head interval is preferably 1 mm to 20 mm, and more preferably 5 mm to 15 mm.

A method for producing a magnetic transfer master carrier used in the magnetic transfer of the present invention will be described. As a substrate for a magnetic transfer master carrier, a non-magnetic metal or alloy such as silicon, quartz plate, glass, and aluminum, a ceramic, a synthetic resin, or the like is a plate-like body having a smooth surface, and is used in etching and film forming processes. What has resistance to processing environments, such as temperature, can be used. A photoresist is applied to a substrate with a smooth surface, and is exposed and developed using a photomask according to the pattern of the preformat, or the photoresist is directly scribed. A corresponding pattern is formed.

Next, in the etching step, the substrate is etched in accordance with the pattern by an etching means for the substrate such as reactive etching, physical etching using argon plasma, etching using a liquid, or the like. The depth of the hole formed by etching is set to a depth corresponding to the thickness of the magnetic layer formed as the transfer information recording portion, and is preferably 20 nm or more and 1000 nm or less. If the thickness is too large, the spread width of the magnetic field increases, which is not desirable. The hole to be formed is preferably a hole having a uniform depth such that the bottom surface is formed by a plane parallel to the surface of the substrate. The hole preferably has a rectangular cross section in the track direction perpendicular to the surface.

Next, the magnetic material is vacuum-deposited by vacuum deposition, sputtering, ion plating, or the like.
A magnetic material is formed up to the surface of the substrate with a thickness corresponding to the hole formed by the plating method. As for the magnetic characteristics of the transfer information recording section, the coercive force (Hc) is 198.9 kA / m (2500 O
e) or less, preferably from 0.39 to 119.3 kA / m
(5 to 1500 Oe), and the saturation magnetic flux density (Bs) is 0.3 T (tesla) or more, preferably 0.5 T
That is all. Next, the photoresist is removed by a lift-off method, and the surface is polished to remove any flash, and the surface is planarized.

In the above description, a method of forming a hole in the substrate and depositing a magnetic material in the formed hole has been described. After forming the convex portion of the transfer information recording portion, a non-magnetic material is formed or filled between the convex portions,
The surface of the transfer information recording section and the surface of the non-magnetic material section may be coplanar.

As a magnetic material that can be used for the magnetic layer, cobalt, iron, or an alloy thereof having a high magnetic flux density can be used. Specifically, Co,
CoPtCr, CoCr, CoPtCrTa, CoPt
CrNbTa, CoCrB, CoNi, Fe, FeC
o, FePt and the like. The thickness of the magnetic layer is 20 to 1000 nm, preferably 30 to 500 nm. If it is too thick, the recording resolution decreases.

In particular, it is clear that the magnetic flux density is large and the magnetic medium has magnetic anisotropy in the same direction as the slave medium, for example, in the in-plane direction for in-plane recording and in the perpendicular direction for perpendicular recording. It is preferable for the transfer to be performed. It is preferable that the magnetic material has fine magnetic particles or an amorphous structure in that a sharp edge can be formed. Also,
In order to form a magnetic material with magnetic anisotropy, it is preferable to provide a nonmagnetic underlayer, and it is necessary that the crystal structure and lattice constant are the same as those of the magnetic layer. Specifically, Cr, CrTi, Co
Cr, CrTa, CrMo, NiAl, Ru or the like can be formed by sputtering.

A protective film such as diamond-like carbon may be provided on the magnetic layer, and a lubricant may be provided. More preferably, a 5 to 30 nm diamond-like carbon film and a lubricant are present as a protective film. Why is it necessary to have a lubricant on it? This is because friction occurs when correcting a shift generated in the contact process with the slave, and durability is insufficient without a lubricant layer. The magnetic transfer master carrier of the present invention is not limited to transfer of magnetic recording information to a disk-type magnetic recording medium such as a hard disk and a large-capacity removable magnetic recording medium, but also to a card-type magnetic recording medium and a tape-type magnetic recording medium. It can also be used for transferring magnetically recorded information.

[0124]

The present invention will be described below with reference to examples. Example 1-1 and Comparative Example 1-1 (Preparation of Magnetic Transfer Master Carrier) After reducing the pressure to 1.33 × 10 ⁻⁵ Pa (10 ⁻⁷ Torr) at room temperature in a vacuum film forming apparatus, argon was removed. 4.0 × 10 ^-1 Pa after introduction
Under a condition of (3 × 10 ⁻³ Torr), a 200 nm-thick FeCo film was formed on a silicon substrate to obtain a disk-shaped 3.5-inch diameter magnetic transfer master carrier. Coercive force H
c is 8 kA / m (100 Oe), and magnetic flux density Ms is 28.
9T (23000 Gauss). The disk-shaped pattern was a radial line having a width of 10 μ and equally spaced from the center of the disk to a position of 20 mm to 40 mm in the radial direction.

(Preparation of Slave Medium) After reducing the pressure to 1.33 × 10 ⁻⁵ Pa (10 ⁻⁷ Torr) at room temperature in a vacuum film forming apparatus, 4.0 × 10 ⁻¹ P was introduced by introducing argon.
a (3 × 10 ⁻³ Torr), the glass
Heat to 0 ° C., CoCrPt 25 nm, Ms: 5.7 T
(4500Gauss), the coercive force H _cs: 199kA / m
A disk-shaped magnetic recording medium having a diameter of 3.5 inches (2500 Oe) was produced.

[0126] coercive force as (initial DC magnetization and magnetic transfer test method of the slave medium) slave medium H _cs: 199 kA
/ M (2500 Oe) disk-shaped magnetic recording medium,
Using a magnetic field applying apparatus shown in FIG. 13, the peak magnetic field strength 398 kA / m (5000 Oe), i.e. at twice the field strength of the coercive force H _cs of the slave medium is brought into close contact with the slave medium and the master carrier for magnetic transfer The initial DC magnetization was performed in the state in which the magnets were placed. Next, in the state where the slave medium that has been initially DC-magnetized and the magnetic transfer master carrier are in close contact with each other, FIG.
The information recorded on the slave medium was transferred by applying a magnetic field in the direction opposite to the direction of the initial DC magnetization using the magnetic field application device shown in FIG. The transfer magnetic field is indicated by the peak intensity of the magnetic field distribution shown in FIG. The close contact between the master carrier for magnetic transfer and the slave medium was pressed from above the aluminum plate with the rubber plate interposed.

(Electromagnetic Conversion Characteristic Evaluation Method) The transfer signal of the slave medium was evaluated by an electromagnetic conversion characteristic measuring device (SS-60 manufactured by Kyodo Electronics). The head used was an inductive head having a head gap of 0.4 μm and a reproduction track width of 3.5 μm. The read signal was frequency-decomposed by a spectroanalyzer, and the difference (C / N) between the peak intensity (C) of the primary signal and the extrapolated medium noise (N) was measured. The maximum value of C / N at each magnetic field strength is 0 dB
The evaluation was performed using relative values (ΔC / N), and the results are shown in Table 1. When the C / N value is -20 dB or less, the signal quality of the magnetic transfer is not at a practical level, and is indicated by *.

[0128]

Table 1 H _{cs of} slave medium 199 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 59.7 0.3 * 99.5 0.5 -13. 5 119 0.6 -3.5 159 0.8 -1.3 179 0.9 -0.9 199 1.0 0.0 219 1.1 -0.7 239 1.2 -4.3 259 1 0.3-6.8 279 1.4-9.6 298 1.5-17.2 318 1.6 * 398 2.0 *

[0129] Examples 1-2 and Comparative Examples 1-2 coercivity H _cs are using slave medium 199 kA / m (2500 Oe), using a magnetic field application device shown in FIG. 13,
Peak field strength 298kA / m (3750Oe), i.e. 1.5 times the magnetic field strength H _cs coercivity of the slave medium, initial DC of the slave medium in the state of being in close contact with the slave medium and the master carrier for magnetic transfer Then, using the magnetic field applying device shown in FIG. 28, the slave medium that has been initially DC-magnetized and the master carrier for magnetic transfer are brought into close contact with each other, and the magnetic field is applied with a transfer magnetic field in the direction opposite to the direction of the initial DC magnetization. After magnetic transfer was performed in the same manner as in Example 1-1 except that the transfer was performed, measurement was performed in the same manner as in Example 1-1.
Table 2 shows the results. The peak intensity of the transfer magnetic field indicates the peak of the magnetic field intensity distribution shown in FIG.

[0130]

TABLE 2 H _cs 199 kA / m magnetic field for transfer of the peak intensity of the slave medium (kA / m) ratio of Hcs △ C / N (dB) 59.7 0.3 * 99.5 0.5 -9. 1 119 0.6 -3.2 159 0.8 -1.3 179 0.9 0.0 199 1.0 0.0 219 1.1 -0.7 239 1.2 -3.5 259 3-6.3 279 1.4-10.2 298 1.5 -16.3 318 1.6 * 398 2.0 *

[0131] the slave medium of Comparative Example 1-3 coercivity H _cs is 199 kA / m (2500 Oe), using a magnetic field application device shown in FIG. 13, the peak magnetic field strength 238.7 kA / m (3000 Oe), i.e. the slave At a magnetic field strength of 1.2 times the coercive force _Hcs of the medium, the initial DC magnetization of the slave medium is performed while the slave medium and the magnetic transfer master carrier are in close contact with each other. Example 1-1, except that magnetic transfer was performed with a transfer magnetic field in a direction opposite to the direction of the initial DC magnetization in a state where the slave medium initially magnetically magnetized and the master carrier for magnetic transfer were in close contact with each other. After magnetic transfer was performed in the same manner, measurement was performed in the same manner as in Example 1-1, and the results are shown in Table 3. The peak intensity of the transfer magnetic field is shown in FIG.
8 shows the peak of the magnetic field strength distribution of FIG.

[0132]

Table 3 H _{cs of} slave medium 199 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 59.7 0.3 * 99.5 0.5 * 1190 0.6 * 159 0.8 * 179 0.9 * 199 1.0 * 219 1.1 * 239 1.2 * 259 1.3 * 2791.4 * 298 1.5 * 318 1.6 * 3982 0.0 *

Example 1-3 and Comparative Example 1-4 The coercive force _Hcs produced in the same manner as in Example 1-1 was 159.
Using a slave medium of kA / m (2000 Oe) and a magnetic field applying device shown in FIG.
18 kA / m (4000 Oe), i.e. at twice the field strength of H _cs coercivity of the slave medium, perform initial DC magnetization of the slave medium in the state of being in close contact with the slave medium and the master carrier for magnetic transfer, then Using the magnetic field applying device shown in FIG. 27, the point that magnetic transfer was performed with a transfer magnetic field in the direction opposite to the direction of the initial DC magnetization in a state where the slave medium initially magnetized with DC and the magnetic transfer master carrier were in close contact with each other. After performing magnetic transfer in the same manner as in Example 1-1, measurement was performed in the same manner as in Example 1-1, and the results are shown in Table 4.
The peak intensity of the transfer magnetic field indicates the peak of the magnetic field intensity distribution shown in FIG.

[0134]

Table 4 H _{cs of} slave medium 159 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 47.7 0.3 * 79.6 0.5 -12. 4 95.5 0.6 -2.6 127 0.8 -1.1 143 0.9 -0.1 159 1.0 0.0 175 1.1 -1.5 191 1.2 -2.9 207 1.3-6.9 223 1.4-10.3 239 1.5-16.4 255 1.6 * 318 2.0 *

[0135] Examples 1-4 and Comparative Examples 1-5 coercivity H _cs are using slave medium 159 kA / m (2000 Oe), using a magnetic field application device shown in FIG. 13,
Peak field strength 234kA / m (3000Oe), i.e. 1.5 times the magnetic field strength H _cs coercivity of the slave medium, initial DC of the slave medium in the state of being in close contact with the slave medium and the master carrier for magnetic transfer Then, using the magnetic field applying device shown in FIG. 28, the slave medium having been subjected to the initial DC magnetization is closely contacted with the master carrier for magnetic transfer. After magnetic transfer was performed in the same manner as in Example 1-1 except that the transfer was performed, measurement was performed in the same manner as in Example 1-1.
Table 5 shows the results. The peak intensity of the transfer magnetic field indicates the peak of the magnetic field intensity distribution shown in FIG.

[0136]

TABLE 5 H _cs 159 kA / m magnetic field for transfer of the peak intensity of the slave medium (kA / m) ratio of Hcs △ C / N (dB) 47.7 0.3 * 79.6 0.5 -16. 9 95.5 0.6 -5.6 127 0.8 -0.8 143 0.9 -0.1 159 1.0 0.0 175 1.1 -0.8 191 1.2 -3.8 207 1.3 -6.8 223 1.4 -9.3 239 1.5 -18.4 255 1.6 * 318 * 2.0 *

Comparative Example 1-6 The coercive force _Hcs produced in the same manner as in Example 1-1 was 159.
Using a slave medium of kA / m (2000 Oe) and a magnetic field applying device shown in FIG.
91kA / m (2400Oe), i.e. 1.2 times the magnetic field strength H _cs coercivity of the slave medium, perform initial DC magnetization of the slave medium in the state of being in close contact with the slave medium and the master carrier for magnetic transfer, Next, using the magnetic field application device shown in FIG. 28, the slave medium initially magnetized with DC was brought into close contact with the master carrier for magnetic transfer, and the magnetic transfer was performed with a transfer magnetic field in the direction opposite to the direction of the initial DC magnetization. After performing magnetic transfer in the same manner as in Example 1-1, measurement was performed in the same manner as in Example 1-1, and the results are shown in Table 6. The peak intensity of the transfer magnetic field indicates the peak of the magnetic field intensity distribution shown in FIG.

[0138]

Table 6 H _{cs of} slave medium 159 kA / m Peak intensity of magnetic field for transfer (kA / m) Ratio to Hcs ΔC / N (dB) 47.7 0.3 * 79.6 0.5 * 95. 5 0.6 * 127 0.8 * 143 0.9 * 159 1.0 * 175 1.1 * 191 1.2 * 207 1.3 * 223 1.4 * 239 1.5 * 255 1.6 * 318 2.0 *

Example 2-1 and Comparative Example 2-1 (Preparation of Master Carrier for Magnetic Transfer) A master carrier for magnetic transfer was prepared in the same manner as in Example 1-1. (Preparation of Slave Medium) A slave medium was prepared in the same manner as in Example 1-1.

[0140] coercive force as (initial DC magnetization and magnetic transfer test method of the slave medium) slave medium H _cs: 199 kA
/ M (2500 Oe) disk-shaped magnetic recording medium,
Using a magnetic field applying apparatus shown in FIG. 35, the peak magnetic field strength 398 kA / m (5000 Oe), i.e. at twice the field strength of the coercive force H _cs of the slave medium is brought into close contact with the slave medium and the master carrier for magnetic transfer In close contact with one
The rotation was stopped after the initial DC magnetization and magnetic transfer were performed by rotating around half a revolution. Next, the magnetic field applied to the slave medium is reversed after the distance between the permanent magnet and the close contact body is increased until the magnetic field intensity applied to the slave medium becomes less than 1/2 of the coercive force _Hcs of the slave medium. After applying a predetermined transfer magnetic field to the surface, the distance between the magnet and the close contact body is increased, and the permanent magnet is applied until the magnetic field intensity applied to the slave medium becomes less than half the coercive force _Hcs of the slave medium. After leaving the distance between the contact body and the contact body, the contact body was taken out. The adhesion between the magnetic transfer master carrier and the slave medium was pressed from above the aluminum plate with the rubber plate interposed therebetween.

(Electromagnetic Conversion Characteristic Evaluation Method) The transfer signal of the slave medium was evaluated by an electromagnetic conversion characteristic measuring device (SS-60 manufactured by Kyodo Electronics). As the head, an inductive head having a head gap of 0.39 μm and a track width of 3.6 μm was used. The read signal was frequency-decomposed by a spectroanalyzer, and the difference (C / N) between the peak intensity (C) of the primary signal and the extrapolated medium noise (N) was measured. The maximum value of C / N at each magnetic field strength is 0 dB
The evaluation was performed using relative values (ΔC / N), and the results are shown in Table 7. When the C / N value is -20 dB or less, the signal quality of the magnetic transfer is not at a practical level, and is indicated by *. In addition,
The peak intensity of the transfer magnetic field indicates the peak intensity of the magnetic field applied to the slave medium.

[0142]

Table 7 H _{cs of} slave medium 199 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 59.7 0.3 * 99.5 0.5 -15. 2 119 0.6 -3.6 159 0.8 -2.5 179 0.9 -0.6 199 1.0 0.0 219 1.1 -0.7 239 1.2 -4.7 259 1 0.3 -6.3 279 1.4-11.2 298 1.5-18.4 318 1.6 * 398 2.0 *

[0143] Examples 2-2 and Comparative Examples 2-2 coercivity H _cs are using slave medium 199 kA / m (2500 Oe), using a magnetic field application device shown in FIG. 35,
Peak field strength 298kA / m (3750Oe), i.e. 1.5 times the magnetic field strength H _cs coercivity of the slave medium, one round the contact member in the state of being in close contact with the slave medium and the master carrier for magnetic transfer The rotation was stopped by performing half-turn to perform initial DC magnetization and magnetic transfer. Next, the magnetic field intensity given to the slave medium is 1 of the coercive force _Hcs of the slave medium.
After the distance between the permanent magnet and the close contact body is increased until it becomes less than / 2, the magnetic field applied to the slave medium is reversed, and a predetermined transfer magnetic field is applied to the slave medium surface. The distance between the permanent magnet and the close contact body was increased until the magnetic field intensity applied to the slave medium was less than 1/2 of the coercive force _Hcs of the slave medium. The results are shown in Table 8. The peak intensity of the transfer magnetic field is
5 shows the peak intensity of the magnetic field applied to the slave medium.

[0144]

Table 8 H _{cs of} slave medium 199 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 59.7 0.3 * 99.5 0.5 -12. 3 119 0.6 -3.9 159 0.8 -2.1 179 0.9 0.6 199 1.0 0.0 219 1.1 -0.2 239 1.2 -3.9 259 1. 3-9.2 279 1.4 -11.3 298 1.5 -16.2 318 1.6 * 398 2.0 *

[0145] The slave medium in Comparative Example 2-3 coercivity H _cs is 199 kA / m (2500 Oe), using a magnetic field application device shown in FIG. 4, the peak magnetic field strength 239 kA / m (3000 Oe), i.e. the slave medium With the magnetic field strength of 1.2 times the coercive force _Hcs , the contact medium is rotated one and a half turns while the slave medium and the master carrier for magnetic transfer are in close contact with each other to perform initial DC magnetization and magnetic transfer and stop rotation. did. Next, the magnetic field applied to the slave medium is reversed after the distance between the permanent magnet and the close contact body is increased until the magnetic field intensity applied to the slave medium becomes less than 1/2 of the coercive force _Hcs of the slave medium. After applying a predetermined transfer magnetic field to the surface, the distance between the magnet and the close contact body is increased, and the permanent magnet is applied until the magnetic field intensity applied to the slave medium becomes less than half the coercive force _Hcs of the slave medium. After separating the contact body from the contact body, the contact body was taken out and measured in the same manner as in Example 2-1. The results are shown in Table 9. Note that the peak intensity of the transfer magnetic field indicates the peak intensity of the magnetic field applied to the slave medium.

[0146]

Table 9 H _{cs of} slave medium 199 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 59.7 0.3 * 99.5 0.5 * 1190 0.6 * 159 0.8 * 179 0.9 * 199 1.0 * 219 1.1 * 239 1.2 * 259 1.3 * 2791.4 * 298 1.5 * 318 1.6 * 3982 0.0 *

[0147] Examples 2-3 and Comparative Examples 2-4 Example 1 coercivity H _cs which was prepared in the same manner as is 159kA
/ M (2000 Oe) using a slave medium.
The peak magnetic field intensity was 318 using the magnetic field application device shown in FIG.
kA / m (4000Oe), i.e. at twice the field strength of H _cs coercivity of the slave medium, close contact with the slave medium and the master carrier for magnetic transfer in the state of being in close contact with the slave medium and the master carrier for magnetic transfer In this state, the contact body was rotated one and a half turns to perform initial DC magnetization and magnetic transfer, and the rotation was stopped. Next, the magnetic field applied to the slave medium is reversed after the distance between the permanent magnet and the close contact body is increased until the magnetic field intensity applied to the slave medium becomes less than 1/2 of the coercive force _Hcs of the slave medium. After applying a predetermined transfer magnetic field to the surface, the distance between the magnet and the close contact body is increased, and the permanent magnet is applied until the magnetic field intensity applied to the slave medium becomes less than half the coercive force _Hcs of the slave medium. After leaving the distance between the contact body and the contact body, the contact body was taken out. The measurement was performed in the same manner as in Example 1, and the results are shown in Table 10. Note that the peak intensity of the transfer magnetic field indicates the peak intensity of the magnetic field applied to the slave medium.

[0148]

Table 10 H _{cs of} slave medium 159 kA / m Peak intensity of transfer magnetic field (kA / m) Ratio to Hcs ΔC / N (dB) 47.7 0.3 * 79.6 0.5 -10. 7 95.5 0.6 -3.9 129 0.8 -2.6 143 0.9 -0.1 159 1.0 0.0 175 1.1 1.0 191 1.2 -3.9 207 1.3-6.2 223 1.4-8.3 239 1.5-16.3 255 1.6 * 318 2.0 *

[0149] Examples 2-4 and Comparative Examples 2-5 coercivity H _cs are using slave medium 159 kA / m (2000 Oe), using a magnetic field application device shown in FIG. 35,
Peak field strength 239 kA / m (3000 Oe), i.e. 1.5 times the magnetic field strength H _cs coercivity of the slave medium, one round the contact member in the state of being in close contact with the slave medium and the master carrier for magnetic transfer The rotation was stopped by performing half-turn to perform initial DC magnetization and magnetic transfer. Next, the magnetic field intensity given to the slave medium is 1 of the coercive force _Hcs of the slave medium.
After the distance between the permanent magnet and the close-contact body is increased until it becomes less than / 2, the magnetic field applied to the slave medium is reversed, and a predetermined transfer magnetic field is applied to the slave medium surface. Was increased, and the distance between the permanent magnet and the close contact body was increased until the magnetic field intensity applied to the slave medium was less than 1/2 of the coercive force _Hcs of the slave medium. The measurement was performed in the same manner as in Example 2-1, and the results are shown in Table 11. Note that the peak intensity of the transfer magnetic field indicates the peak intensity of the magnetic field applied to the slave medium.

[0150]

TABLE 11 H _cs 159 kA / m magnetic field for transfer of the peak intensity of the slave medium (kA / m) ratio of Hcs △ C / N (dB) 47.7 0.3 * 79.6 0.5 -13. 5 95.5 0.6 -4.3 127 0.8 -3.8 143 0.9 -0.2 159 1.0 0.0 175 1.1 -0.8 191 1.2 -4.5 207 1.3 -6.8 223 1.4-11.9 239 1.5-19.2 255 1.6 * 318 2.0 *

Comparative Example 2-6 A coercive force _Hcs produced in the same manner as in Example 2-1 was 159.
Using a slave medium of kA / m (2000 Oe) and a magnetic field applying device shown in FIG.
91kA / m (2400Oe), i.e. 1.2 times the magnetic field strength H _cs coercivity of the slave medium, and the adhesion member is rotated one turn and a half while being in close contact with the slave medium and the master carrier for magnetic transfer Initial DC magnetization and magnetic transfer were performed and rotation was stopped. Next, the magnetic field applied to the slave medium is reversed after the distance between the permanent magnet and the close contact body is increased until the magnetic field intensity applied to the slave medium becomes less than 1/2 of the coercive force _Hcs of the slave medium. After applying a predetermined transfer magnetic field to the surface, the distance between the magnet and the close contact body is increased, and the permanent magnet is applied until the magnetic field intensity applied to the slave medium becomes less than 1/2 of the coercive force _Hcs of the slave medium. After leaving the distance between the contact body and the contact body, the contact body was taken out. The measurement was performed in the same manner as in Example 2-1, and the results are shown in Table 12. Note that the peak intensity of the transfer magnetic field indicates the peak intensity of the magnetic field applied to the slave medium.

[0152]

Table 12 ratio △ C / N (dB) of the H _cs 159 kA / m magnetic field for transfer of the peak intensity of the slave medium (kA / m) Hcs 47.7 0.3 * 79.6 0.5 * 95. 5 0.6 * 127 0.8 * 143 0.9 * 159 1.0 * 175 1.1 * 191 1.2 * 207 1.3 * 223 1.4 * 239 1.5 * 255 1.6 * 318 2.0 *

[0153]

In the magnetic transfer from the magnetic transfer master carrier to the slave medium, the coercive force _Hcs of the slave medium is used.
By applying a transfer magnetic field having a specific strength to the slave medium, a slave medium having a high-quality transfer pattern can be obtained regardless of the position or shape of the pattern.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating pattern transfer on a magnetic transfer master carrier.

FIG. 2 is a diagram illustrating a magnetic field generation and application device using a single permanent magnet having a magnetic field symmetrical with respect to the center axis of a magnetic pole with respect to a slave medium surface.

FIG. 3 is a diagram illustrating application of an asymmetric magnetic field by a single permanent magnet.

FIG. 4 is a diagram illustrating a method of applying a magnetic field using two opposed permanent magnets.

FIG. 5 is a diagram for explaining a method of applying a magnetic field using a tilted permanent magnet.

FIG. 6 is a diagram illustrating a method of applying a magnetic field using a single lateral permanent magnet.

FIG. 7 is a diagram illustrating a method of applying a magnetic field using a permanent magnet in which two pairs of magnets are arranged adjacent to each other.

FIG. 8 is a diagram for explaining a method of applying a magnetic field in which two permanent magnets are arranged adjacent to one surface of an adhered body of a slave medium and a master carrier for magnetic transfer.

FIG. 9 is a diagram illustrating a method of applying a magnetic field arranged on the contact body surface with the end faces of both magnetic poles of one permanent magnet facing the contact body surface;

FIG. 10 is a diagram illustrating an example of a permanent magnet in which both magnetic poles of the permanent magnet are arranged so that end faces thereof face the slave medium surface and a magnetic field can be applied to the slave medium by both magnetic poles;

FIG. 11 is a diagram for explaining a method of applying a magnetic field in which an electromagnet is provided on one of the upper surface and the lower surface of a closely adhered body in which a slave medium and a magnetic transfer master carrier are closely adhered.

FIG. 12 is a diagram illustrating a method of applying a magnetic field using a gradient electromagnet.

FIG. 13 is a diagram illustrating a method of applying a magnetic field using two electromagnets.

FIG. 14 is a diagram illustrating another method of applying a magnetic field using an electromagnet.

FIG. 15 is a diagram for explaining a method of applying a magnetic field in which two pairs of electromagnets are arranged adjacent to each other with the slave medium interposed therebetween perpendicular to the slave medium surface.

FIG. 16 is a diagram illustrating a method of applying a magnetic field using a single lateral electromagnet.

FIG. 17 is a diagram for explaining a method of applying a magnetic field in which two electromagnets are arranged adjacent to one surface of an adhered body in which a slave medium and a magnetic transfer master carrier are in close contact with each other.

FIG. 18 is a diagram illustrating a method of applying a magnetic field using a ring-type head electromagnet.

FIG. 19 is a diagram illustrating a method of applying a magnetic field using an annular electromagnet.

FIG. 20 is a diagram illustrating a transfer method and a transfer apparatus in which the axis of the magnetic pole of a single permanent magnet is arranged obliquely with respect to the slave medium surface and a magnetic field is applied.

FIG. 21 is a diagram illustrating a transfer method and a transfer apparatus in which axes of magnetic poles of a permanent magnet are arranged obliquely to both surfaces of a slave medium with respect to the slave medium surface and a magnetic field is applied.

FIG. 22 is a diagram illustrating a transfer method and a transfer device in which a single lateral permanent magnet is provided and a magnetic field is applied.

FIG. 23 is a diagram illustrating a transfer method and a transfer apparatus in which two pairs of permanent magnets are arranged adjacent to each other with a slave medium interposed therebetween perpendicularly to the slave medium surface to apply a magnetic field.

FIG. 24 illustrates a transfer method and a transfer apparatus in which two permanent magnets are arranged adjacent to one surface of an adhered body of a slave medium and a magnetic transfer master carrier to apply a magnetic field. FIG.

FIG. 25 is a diagram illustrating a transfer method and a transfer apparatus in which both magnetic poles of one permanent magnet are arranged on the slave medium surface with the end faces facing the slave medium surface and a magnetic field is applied.

FIG. 26 is a diagram illustrating a transfer method and a transfer device in which an electromagnet is provided on one surface of a contact body and a magnetic field is applied.

FIG. 27 is a diagram illustrating a transfer method and a transfer device in which two inclined electromagnets are provided and a magnetic field is applied.

FIG. 28 is a diagram illustrating a transfer method in which two pairs of electromagnets are arranged and arranged adjacent to each other with a slave medium interposed therebetween perpendicularly to an adhered body of the slave medium and a master carrier for magnetic transfer, and a magnetic field is applied; FIG. 3 is a diagram illustrating a method and a transfer device.

FIG. 29 is a diagram illustrating a transfer method and a transfer device that apply a magnetic field using a single lateral electromagnet.

FIG. 30 is a diagram illustrating a transfer method and a transfer apparatus in which two electromagnets are arranged adjacent to one surface of a contact body and a magnetic field is applied.

FIG. 31 is a diagram illustrating a transfer method and a transfer device in which a ring-type head electromagnet is provided and a magnetic field is applied.

FIG. 32 is a diagram illustrating a transfer method and a transfer device in which an annular electromagnet is provided and a magnetic field is applied.

FIG. 33 is a diagram for explaining application of a magnetic field to an adhered body between a disk-shaped slave medium and a magnetic transfer master carrier.

FIG. 34 is a diagram illustrating a method of applying a magnetic field using a single inclined permanent magnet.

FIG. 35 is a diagram illustrating a method of applying a magnetic field using two inclined permanent magnets.

FIG. 36 is a diagram for explaining a method of applying a magnetic field using a horizontal permanent magnet.

FIG. 37 is a magnetic field using a permanent magnet in which two pairs of magnets are disposed adjacent to each other with a close contact perpendicular to the slave medium surface of the close contact between the slave medium and the master carrier for magnetic transfer; FIG. 4 is a diagram for explaining a method of applying a voltage.

FIG. 38 is a diagram for explaining a method of applying a magnetic field in which two permanent magnets are arranged adjacent to one surface of an adhered body of a slave medium and a magnetic transfer master carrier.

FIG. 39 is a diagram illustrating a method of applying a magnetic field arranged on the contact body surface with the end faces of both magnetic poles of one permanent magnet facing the contact body surface.

FIG. 40 is a diagram for explaining a method of disposing an inclined electromagnet on one surface of the contact body and applying a magnetic field.

FIG. 41 is a diagram illustrating a method of applying a magnetic field in which a pair of inclined electromagnets are provided on both surfaces of a close contact body.

FIG. 42 is a diagram for explaining a method of applying a magnetic field in which two pairs of electromagnets are arranged adjacent to each other with the slave medium interposed therebetween perpendicular to the slave medium surface.

FIG. 43 is a diagram illustrating a method of applying a magnetic field using a single lateral electromagnet.

FIG. 44 is a diagram for explaining a method of applying a magnetic field in which two electromagnets are arranged adjacent to one surface of a closely adhered body in which a slave medium and a magnetic transfer master carrier are closely adhered.

FIG. 45 is a diagram illustrating a method of applying a magnetic field using a ring-type head electromagnet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Master carrier for magnetic transfer, 2 ... Preformatted area, 3 ... Data area, 4 ... Slave medium, 5 ... Track direction, 6 ... External magnetic field for transfer, 6a ... Magnetic field absorbed by a convex part, 7 ... Recording information , 8, 8a, 8b, 8c, 8d: permanent magnet, 81, 81a, 81b: inclined permanent magnet, 8x,
8y: End faces of both magnetic poles, 82, 82a, 82b, 82c,
82d: electromagnet, 83, 83a, 83b: inclined electromagnet,
84: ring type head electromagnet, 85: annular electromagnet, 9 ...
Magnetic field, 10 peaks, 11a, 11b optimal transfer magnetic field intensity peak, 12 asymmetric magnetic field, 13 small intensity peak, 14 large intensity peak, 15 adhesion body, 16,
16a, 16b, 16c, 16d: DC power supply, 21, 22
2, 23, 24: coil, 25, 26, 27, 28: gap between coils, D1, D2: distance between end portions of permanent magnet, D3
D4: distance between electromagnet ends, P1: magnetic field position for initial DC magnetization, P2: magnetic field position for magnetic transfer, U: initial DC magnetization region, R: reinitial DC magnetization region

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shoichi Nishikawa 2-1-1, Ogimachi, Odawara-shi, Kanagawa F-Term in Fuji Photo Film Co., Ltd. 5D112 AA24 DD00 DD09 GA00

Claims (17)

[Claims] 1. A magnetic transfer method for applying a transfer magnetic field by closely adhering a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on a surface of a substrate and a slave medium to be transferred. A magnetic transfer method, wherein initial magnetization performed before transfer is performed in a state in which a master carrier for magnetic transfer and a slave medium are in close contact with each other. 2. A magnetic transfer method for applying a transfer magnetic field by closely adhering a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate and a slave medium to be transferred. With the transfer master carrier and the slave medium in close contact, a magnetic field is applied in the track direction of the slave medium surface, the magnetization of the slave medium is initially DC-magnetized in the track direction, and then transferred in the track direction of the slave medium surface. A magnetic transfer method, wherein a magnetic field is applied to perform magnetic transfer. 3. A magnetic field having a magnetic field intensity distribution having at least one magnetic field intensity portion at least at one position in the track direction at least 1.5 times the coercive force _Hcs of the slave medium is generated in a part in the track direction. 3. A magnetic field for initial DC magnetization of the slave medium magnetization in the track direction by rotating the magnetic field in the track direction, or by rotating the magnetic field in the track direction. The magnetic transfer method according to any one of the above. 4. A magnetic transfer method for applying a transfer magnetic field by closely adhering a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on a surface of a substrate to a transfer-receiving slave medium. A magnetic field having a magnetic field intensity distribution for initial DC magnetization 1.5 times or more of the coercive force _Hcs of the medium is generated in a part of the track direction, and after the magnetic field for initial DC magnetization is applied, the magnetic field for magnetic transfer is changed to the surface of the slave medium. With the slave medium and the magnetic transfer master carrier in close contact with each other, the contact body or the magnetic field is rotated so that the magnetic transfer master carrier and the slave medium are in close contact with each other and the slave medium surface is rotated. A magnetic field is applied in the track direction, and a transfer magnetic field is applied to the slave medium surface immediately after the initial DC magnetization of the magnetization of the slave medium, thereby performing magnetic transfer. Magnetic transfer method. 5. The magnetic transfer method according to claim 1, wherein the coercive force H _cm of the magnetic layer of the magnetic transfer master carrier is 47.7 kA / m (600 Oe) or less. 6. A coercive force H _{cs of a} slave medium to be transferred.
The magnetic transfer method according to any one of claims 1 to 4, wherein is less than 143 kA / m (1800 Oe). 7. The method according to claim 1, wherein a direction in which a magnetic field in the track direction is applied to the slave medium to perform initial DC magnetization is opposite to a transfer magnetic field applied for performing magnetic transfer on the surface of the slave medium. 5. The magnetic transfer method according to any one of 1 to 4. 8. A portion having a magnetic field strength exceeding the maximum value of the optimum transfer magnetic field strength range does not exist in any of the track directions, and a portion having a magnetic field strength within the optimum transfer magnetic field strength range is one.
A magnetic field of a magnetic field intensity distribution which is present in at least one location in one track direction and whose magnetic field strength in the opposite track direction is less than the minimum value of the optimum transfer magnetic field strength range at any position in the track direction. The magnetic field for transfer in the track direction on the slave medium surface is generated by rotating the master carrier for magnetic transfer and the slave medium that has been initially DC magnetized in the track direction, or by rotating the magnetic field in the track direction. 5. The magnetic transfer method according to claim 2, wherein the method is applied. 9. A magnetic transfer method according to claim 8, optimal transfer magnetic field intensity is characterized in that it is a 0.6 × H _cs ~1.3 × H _cs against the coercive force H _cs of the slave medium. 10. A magnetic transfer device for applying a transfer magnetic field by bringing a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on the surface of a substrate into close contact with a slave medium to be transferred. A means for adhering the transfer master carrier and the slave medium, and applying a magnetic field in the track direction on the slave medium surface in a state where the magnetic transfer master carrier and the slave medium are adhered to each other so that the magnetization of the slave medium is initialized in the track direction in advance. Magnetic transfer characterized by having initial DC magnetizing means for magnetizing, and a transfer magnetic field applying means for applying a transfer magnetic field in the track direction of the slave medium in a state in which the master medium for magnetic transfer and the slave medium with initial DC magnetization are in close contact with each other. apparatus. 11. The magnetic transfer apparatus according to claim 10, wherein the coercive force H _cm of the magnetic layer of the magnetic transfer master carrier is 47.7 kA / m (600 Oe) or less. 12. A coercive force H of a slave medium to be transferred.
11. The magnetic transfer apparatus according to claim 10, wherein _cs is 143 kA / m (1800 Oe) or more. 13. The slave medium according to claim 10, wherein a direction in which a track direction magnetic field is applied to the slave medium to perform initial DC magnetization and a transfer magnetic field applied for performing magnetic transfer are opposite to each other on the surface of the slave medium. 7. The magnetic transfer device according to item 1. 14. The initial DC magnetizing means has a magnetic field intensity portion which is 1.5 times or more the coercive force _Hcs of the slave medium in only one direction at the track direction position, and the magnetic field intensity in the opposite direction is different in any one of the tracks. Coercive force H _{cs of the} slave medium
A magnetic field having a magnetic field intensity distribution of less than a portion in the track direction is generated in a part of the track direction, and the slave medium magnetization is rotated in the track direction by rotating the magnetic body in the track direction or the contact body between the slave medium and the master carrier for magnetic transfer. The magnetic transfer apparatus according to claim 10, wherein a magnetic field for initial DC magnetization is applied. 15. A transfer magnetic field applying means, wherein a magnetic field intensity exceeding the maximum value of the optimum transfer magnetic field intensity range does not exist at any track direction position, and a portion having a magnetic field intensity within the optimum transfer magnetic field intensity range is defined as one track. A magnetic field having a magnetic field intensity distribution in which the magnetic field intensity in the track direction in the opposite direction is less than the minimum value of the optimum transfer magnetic field intensity range in any track direction position is generated in a part of the track direction. Means for rotating the master medium for magnetic transfer and the slave medium initially DC-magnetized in the track direction while keeping the master medium in close contact, or means for rotating the magnetic field in the track direction, and 11. The magnetic transfer device according to claim 10, wherein a transfer magnetic field is applied to the magnetic transfer device. 16. A magnetic transfer apparatus for applying a transfer magnetic field by bringing a magnetic transfer master carrier having a magnetic layer formed on a portion corresponding to an information signal on a surface of a substrate into close contact with a slave medium to be transferred. A means for applying an initial DC magnetization of 1.5 times or more the coercive force _Hcs of the medium, a magnetic transfer magnetic field applying means in an optimum transfer magnetic field strength range opposite to the direction of the magnetic field for the initial DC magnetization, and a slave medium. The magnetic transfer master carrier and the slave medium are provided with a rotation means for rotating one of a magnetic field in a track direction or a close contact body between the slave medium and the magnetic transfer master carrier. Immediately after the magnetic field is applied in the track direction on the slave medium surface in the state of being in close contact with the slave medium and the magnetization of the slave medium is initially DC-magnetized in the track direction, the master carrier for magnetic transfer is used. A magnetic transfer apparatus wherein a magnetic field for transfer is applied in the track direction of the slave medium in a state where the slave medium which has been initially DC magnetized is in close contact with the slave medium to perform magnetic transfer. 17. The optimum transfer magnetic field intensity is 0.6 × H _cs or _less .
The magnetic transfer apparatus according to claim 15, wherein the value is 1.3 × H _cs .