JP2002312905A - Magnetic head, and magnetic recording apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the surface recording density on a recording medium by reducing the track width while preventing the reduction in the intensity of a magnetic field generated by the magnetic poles of a magnetic head. SOLUTION: The recording medium has a disk shape, and a plurality of circular tracks 20 arrayed at specified cycles. The magnetic head is provided with a medium facing surface opposed to the recording medium, and a magnetic pole 10 for generating a magnetic field from an end arranged in the medium surface in order to record information in the recording medium. The pole width PW of the magnetic pole 10 is larger than the cycle TP of the track 20 of the recording medium. The recording of the information in the recording medium is carried out by moving a magnetic head position in a direction along the track 20 with respect to the recording medium. After the end of recording in one track 20, the magnetic head is moved by the cycle TP of the track 20, and recording is carried out in a next track 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head used for recording information on a magnetic recording medium, and a magnetic recording apparatus and a method for recording information on a magnetic recording medium using the magnetic head.

[0002]

2. Description of the Related Art As a magnetic head in a magnetic recording / reproducing apparatus such as a hard disk drive, a recording head having an inductive electromagnetic transducer for writing and a magneto-resistive element for reading (hereinafter, MR (Magneto-resistive) element) are used. ) Is widely used.

[0003] Further, the recording method in the magnetic recording / reproducing apparatus includes a longitudinal magnetic recording method in which the direction of signal magnetization is set to an in-plane direction (longitudinal direction) of the magnetic recording medium, and a direction in which signal magnetization is directed to the surface of the magnetic recording medium. There is a perpendicular magnetic recording method in which the direction is perpendicular to the direction. It is said that the perpendicular magnetic recording system is less susceptible to the thermal fluctuation of the recording medium and can realize a high linear recording density, as compared with the longitudinal magnetic recording system.

A magnetic head for a longitudinal magnetic recording system generally includes a medium facing surface facing a recording medium, and magnetic poles magnetically coupled to each other and facing each other via a gap on the medium facing surface side. First and second magnetic layers;
At least a portion is located between the first and second magnetic layers.
And a thin-film coil provided insulated from the second magnetic layer.

On the other hand, a magnetic head for a perpendicular magnetic recording system includes a ring head having the same structure as a magnetic head for a longitudinal magnetic recording system, and a single main magnetic pole for applying a magnetic field perpendicular to the surface of a recording medium. There is a single pole head to apply.
When a single-pole head is used, a two-layer medium in which a soft magnetic layer and a magnetic recording layer are laminated on a substrate is generally used as a recording medium.

Here, an example of a single-pole magnetic head for a perpendicular magnetic recording system will be briefly described with reference to FIG. FIG. 14 shows the medium facing surface of the magnetic head.
Magnetic head shown in FIG. 14, AlTiC (Al ₂ O ₃
A substrate 101 made of a ceramic material such as TiC);
An insulating layer 102 made of an insulating material formed on the substrate 101, a lower shield layer 103 made of a magnetic material formed on the insulating layer 102, and an insulating layer 104 formed on the lower shield layer 103. And an upper shield layer 106 made of a magnetic material and formed on the MR element 105 with an insulating layer 104 interposed therebetween. The portion from the lower shield layer 103 to the upper shield layer 106 becomes a read head.

The magnetic head shown in FIG. 14 further includes an insulating layer 107 made of an insulating material formed on the upper shield layer 106, a thin film coil (not shown) formed on the insulating layer 107, An insulating layer 109 made of an insulating material covering the thin film coil, a magnetic pole 110 formed on the insulating layer 109, and a protective layer 111 made of an insulating material covering the magnetic pole 110 are provided. Upper shield layer 1
The portion from 06 to the magnetic pole 110 becomes the recording head. The magnetic pole 110 corresponds to the main magnetic pole of the write head, and the upper shield layer 106 also serves as the auxiliary magnetic pole of the write head.

[0008] One end of the MR element 105 and one end of the magnetic pole 110 are arranged on the medium facing surface. The magnetic pole 110 is located at a position distant from the medium facing surface.
Are magnetically connected to The thin-film coil has a magnetic pole 110
And the upper shield layer 106.

In FIG. 14, PW represents the width of the magnetic pole 110 on the medium facing surface (hereinafter, referred to as magnetic pole width).
L represents a length in a direction orthogonal to a width direction of the magnetic pole 110 on the medium facing surface (hereinafter, referred to as a magnetic pole length).

FIG. 15 shows a positional relationship between a magnetic pole 110 of a magnetic head and a track of a recording medium when information is recorded. The recording medium has a plurality of tracks 120 arranged at a predetermined cycle. In FIG. 15, TW represents the width of the track 120, and TP represents the cycle (track pitch) of the track 120. The width TW of the track 120 is equal to the magnetic pole width PW.

The recording of information on the recording medium is performed while moving the position of the magnetic head relative to the recording medium in the direction along the track 120. When the recording on one track 120 is completed, the magnetic head moves to the next track 1
20 and the recording is performed similarly. A magnetic field including a component in a direction perpendicular to the surface of the recording medium is generated from the magnetic pole 110, and this magnetic field causes magnetization in the recording medium in a direction perpendicular to the surface of the recording medium. By switching the direction of the magnetic field generated from the magnetic pole 110, the direction of magnetization in the recording medium is switched, whereby digital information is recorded on the recording medium. In FIG. 15, a hatched portion and other portions in the track 120 represent magnetization patterns whose magnetization directions are different from each other by 180 °.

As shown in FIG. 15, when recording information, due to the spread of the magnetic field generated from the magnetic pole 110, regions that disturb the magnetization in the recording medium are generated on both sides in the width direction of the magnetic pole 110. Hereinafter, this area is referred to as a side erase area 121. Since the side erase area 121 exists, the width TW of the track 120 is
Cycle TP.

At present, magnetic recording / reproducing apparatuses tend to increase the areal recording density of a recording medium by increasing the linear recording density and the track density of the recording medium. For this purpose, there is a demand for improved performance of both the recording medium and the magnetic head.

As a method of increasing the linear recording density, the magnetic particles constituting the recording medium are miniaturized and have a high coercive force so that a fine magnetic pattern can be recorded on the recording medium. On the other hand, as a method of increasing the track density, the magnetic pole width PW is reduced in order to reduce the width TW of the track 120.

Generally, in order to prevent information recorded on an adjacent track 120 from being accidentally erased when information is written on a certain track 120 by a magnetic head, as shown in FIG. The magnetic pole width PW of the magnetic head is designed to be smaller than the period TP of the track 120.

On the other hand, a higher coercive force of the recording medium is required to generate a larger recording magnetic field in the recording head. Therefore, in designing a recording head, a structure for generating a large recording magnetic field with higher efficiency is being developed. In addition, the use of a material having a high saturation magnetic flux density for the magnetic poles in the recording head has been promoted.

[0017]

Hitherto, in order to increase the track density, it has been necessary to reduce the magnetic pole width PW of the recording head. However, when the magnetic pole width PW is reduced, the magnetic flux saturates before reaching the tip of the magnetic pole 110, and the magnetic pole 1
There is a problem that the intensity of the magnetic field generated from the antenna 10 decreases. The decrease in the magnetic field strength due to the saturation of the magnetic flux becomes remarkable when the magnetic pole width PW becomes 0.2 μm or less, that is, when the track width TW becomes 0.2 μm or less.

It is conceivable to increase the magnetic pole length PL in order to suppress the decrease in the magnetic field strength due to the saturation of the magnetic flux. However, in this case, as explained below,
Problems due to skew occur. First, the skew will be described with reference to FIG. As shown in FIG. 16, in the hard disk drive in which the head is positioned by the rotary actuator, the magnetic head moves along the circular orbit 135 around the rotation center 134 of the rotary actuator in the recordable area 1 of the recording medium 130.
Move inside 33. In this case, an inclination of the magnetic head with respect to a tangent of the circular track, called skew, occurs according to the position of the head in the cross-track direction. The angle of this inclination is called a skew angle. Usually, the skew angle θs is
When the magnetic head is at an intermediate position in the recordable area 133, it is designed to be almost 0 °. The skew angle θs generated when the magnetic head is at the inner peripheral position is represented by a negative value, and the skew angle θs generated when the magnetic head is at the outer peripheral position is a positive value. It is represented by

Next, the influence of skew when the magnetic pole length PL of the magnetic pole 110 is significantly larger than the magnetic pole width PW will be described with reference to FIGS. 17 to 19 show that the skew angle θs is 0 ° and −1, respectively.
This shows the positional relationship between the track 120 and the magnetic pole 110 at 5 ° and 15 °. Cross section of magnetic pole 110 (PL × P
Considering the case where PL / PW is changed while W) is kept constant, as PL / PW increases, even if the skew angle is the same, the leading edge or the trailing edge of the magnetic pole 110 in the moving direction of the magnetic pole 110 with respect to the recording medium. The amount of the edge protruding from the track 120 on which information is to be recorded increases. Therefore, when the magnetic pole length PL is increased, the leading edge or the trailing edge of the magnetic pole 110 extends over the adjacent track 120,
Overwriting on the adjacent track 120 occurs.
In FIGS. 18 and 19, reference numeral 122 indicates an area where overwriting occurs in the adjacent track 120.

In particular, in a perpendicular magnetic recording system using a two-layer medium, recording is performed with different phases at the leading edge and the trailing edge of the magnetic pole 110. (See Kitano et al., "Effects of recording current and head skew on perpendicular recording characteristics", 24th Annual Meeting of the Japan Society of Applied Magnetics, 2000, p. 312). This curved residual magnetization pattern degrades the quality of information recorded on the recording medium.

The lithography technique is used for forming and processing the magnetic pole 110 of the recording head. In the current lithography apparatus using a laser as a light source, the lower limit of the processing dimension is about 0.2 μm. In order to perform processing with smaller dimensions, a lithography apparatus using X-rays, electron beams, or the like instead of a laser beam is required, which increases the cost of the apparatus and lowers the throughput.

As described above, conventionally, when the magnetic pole width PW is reduced in order to reduce the track width TW, the strength of the magnetic field generated from the magnetic pole 110 is reduced, and the formation of the fine magnetic pole 110 is difficult. Due to the technical difficulty, there has been a limit in improving the areal recording density of the recording medium.

The present invention has been made in view of the above problems, and has as its object to reduce the track width and prevent the magnetic field generated from the magnetic poles of the magnetic head from decreasing, thereby reducing the areal recording density on a recording medium. To provide a magnetic head, a magnetic recording apparatus, and a method that can improve the magnetic field and facilitate the formation of a magnetic pole.

[0024]

According to the present invention, there is provided a magnetic head comprising:
Information is recorded on a disk-shaped magnetic recording medium having a plurality of circular tracks arranged at a predetermined period, and a medium facing surface facing the magnetic recording medium, and information recorded on the magnetic recording medium. A coil for generating a magnetic field corresponding to the magnetic field, and one end disposed on the medium facing surface, allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass, and a magnetic field for recording information on a magnetic recording medium. A magnetic pole generated from one end of the magnetic recording medium, and the width of the one end of the magnetic pole is larger than the track period of the magnetic recording medium.

In the magnetic head of the present invention, the width of one end of the magnetic pole is larger than the track cycle of the magnetic recording medium, but the position of the magnetic head with respect to the magnetic recording medium is moved by the track cycle in the cross-track direction. Accordingly, information can be recorded on each track.

In the magnetic head of the present invention, the length of the one end of the magnetic pole in the direction perpendicular to the width direction may be smaller than the width of the one end.

Further, in the magnetic head of the present invention, the track period may be 0.2 μm or less.

Further, the magnetic head of the present invention may further include a reproducing element for reproducing information recorded on the magnetic recording medium.

A magnetic recording apparatus according to the present invention comprises a disk-shaped magnetic recording medium having a plurality of circular tracks arranged at a predetermined cycle, a magnetic head for recording information on the magnetic recording medium, and a magnetic recording medium. A first moving means for moving the position of the magnetic head relative to the recording medium in a direction along the track, a second moving means for moving the position of the magnetic head relative to the magnetic recording medium in the cross-track direction,
A magnetic head comprising: a medium facing surface facing the magnetic recording medium; and a coil for generating a magnetic field corresponding to information to be recorded on the magnetic recording medium. And a magnetic pole having one end disposed on the medium facing surface, allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass, and generating a magnetic field for recording information on the magnetic recording medium from the one end. The width of one end of the magnetic pole is larger than the track period of the magnetic recording medium.

In the magnetic recording apparatus of the present invention, the width of one end of the magnetic pole is larger than the track period of the magnetic recording medium.
By moving the position of the magnetic head with respect to the magnetic recording medium in the track crossing direction at intervals of the track, information can be recorded on each track.

In the magnetic recording apparatus of the present invention, the length of the one end of the magnetic pole in the direction perpendicular to the width direction may be smaller than the width of the one end.

In the magnetic recording apparatus of the present invention, the track period may be 0.2 μm or less.

[0033] In the magnetic recording apparatus of the present invention, the magnetic head may further include a reproducing element for reproducing information recorded on the magnetic recording medium.

In the magnetic recording apparatus of the present invention, the recording medium includes a plurality of tracks arranged in a row and has a continuous recording area in which information is continuously recorded on the plurality of tracks. When information is recorded in the continuous recording area, the second moving means may be controlled such that the position of the magnetic head with respect to the magnetic recording medium moves by a period of the track in the cross-track direction.
In this case, the recording medium may have a plurality of continuous recording areas arranged with an interval of at least the difference between the width of one end of the magnetic pole and the width of the track. Further, the recording medium further includes 1
It may have a single recording area in which information is recorded in track units. Further, the control means, when recording information in a single recording area, moves the position of the magnetic head with respect to the magnetic recording medium in the cross-track direction by a distance equal to or greater than the width of one end of the magnetic pole as one unit. The second moving means may be controlled.

In the magnetic recording apparatus of the present invention, the magnetic recording medium may have magnetic anisotropy in which the axis of easy magnetization is oriented in a direction perpendicular to the surface of the magnetic recording medium.

In the magnetic recording device of the present invention, positioning information used for positioning the magnetic head with respect to the magnetic recording medium may be recorded on the magnetic recording medium in advance.

The magnetic recording method of the present invention has a medium facing surface facing a magnetic recording medium, a coil for generating a magnetic field corresponding to information recorded on the magnetic recording medium, and one end disposed on the medium facing surface. And a magnetic pole having a magnetic pole for passing a magnetic flux corresponding to the magnetic field generated by the coil and generating a magnetic field from one end for recording information on a magnetic recording medium. A method for recording information on a disk-shaped magnetic recording medium having a plurality of circular tracks formed as described above, wherein the width of one end of a magnetic pole is larger than the track period of the magnetic recording medium. While moving the position of the magnetic head with respect to the magnetic recording medium in the direction along the track,
A procedure for recording information on one track and a procedure for recording information are alternately performed, and include a procedure for moving the position of the magnetic head with respect to the magnetic recording medium in the cross-track direction by the period of the track.

According to the magnetic recording method of the present invention, a procedure for recording information on one track by using a magnetic head in which the width of one end of the magnetic pole is larger than the track period of the magnetic recording medium, The information is recorded in each track by alternately executing the procedure of moving the position in the track cross direction by the period of the track.

In the magnetic recording method according to the present invention, the track period may be 0.2 μm or less.

[0040]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, an outline of a magnetic head and a magnetic recording method according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a positional relationship between a magnetic pole of a magnetic head and a track of a magnetic recording medium in the present embodiment. The magnetic recording medium according to the present embodiment has a disk shape and has a plurality of circular tracks arranged at a predetermined period. Such a magnetic recording medium is, for example, a hard disk. The magnetic recording medium according to the present embodiment is for a perpendicular magnetic recording system, and has magnetic anisotropy in which the axis of easy magnetization is oriented in a direction perpendicular to the surface of the magnetic recording medium. FIG. 1 shows a plurality of tracks 2
0 is partially shown. In FIG. 1, TW represents the width of the track 20, and TP represents the period (track pitch) of the track 20.

The magnetic head according to the present embodiment includes a magnetic pole 10 for generating a magnetic field for recording information on a magnetic recording medium from one end disposed on the medium facing surface. And In the present embodiment, the width PW of one end of the magnetic pole 10 (hereinafter referred to as magnetic pole width) is equal to the period TP of the track 20 of the magnetic recording medium.
Is bigger than. FIG. 1 shows an example in which the magnetic pole width PW is about twice the period TP of the track 20, specifically, the magnetic pole width PW is TP + TW.

Recording of information on the recording medium is performed while moving the position of the magnetic head relative to the recording medium in the direction along the track 20. When the recording on one track 20 is completed, the magnetic head is moved by the period TP of the track 20, and the recording on the next track 20 is performed. In the present embodiment, the magnetic pole width PW of the magnetic pole 10 is
Since the period is longer than the period TP of the track 20, when recording information on one track 20, the same information is written on the next track 20. However, after the recording on one track 20 is completed, the magnetic head is moved by the period TP of the track 20 and the recording on the next track 20 is performed, so that the regular information is overwritten on the next track 20. . Therefore, different information can be recorded for each track.

A magnetic field including a component in a direction perpendicular to the surface of the recording medium is generated from the magnetic pole 10, and the magnetic field causes magnetization in the recording medium in a direction perpendicular to the surface of the recording medium. By switching the direction of the magnetic field generated from the magnetic pole 10, the direction of the magnetization in the recording medium is switched, whereby digital information is recorded on the recording medium. In FIG. 1, a hatched portion and other portions in the track 20 represent magnetization patterns whose magnetization directions are different from each other by 180 °.

As shown in FIG. 1, when recording information,
Due to the spread of the magnetic field generated from the magnetic pole 10, regions that disturb the magnetization in the recording medium are generated on both sides in the width direction of the magnetic pole 10. Hereinafter, this region is referred to as a side erase region 21. Since this side erase area 21 exists,
The width TW of the track 20 is smaller than the period TP of the track 20.

Next, the magnetic head according to this embodiment will be described. The magnetic head according to the present embodiment may be a single-pole head or a ring head. 2 and 3 show an example of the configuration of the magnetic head according to the present embodiment when a single pole head is used, and FIGS. 4 and 5 show the configuration of the magnetic head according to the present embodiment when a ring head is used. An example is shown. 2 and 4 show the medium facing surface of the magnetic head, and FIGS. 3 and 5 show cross sections perpendicular to the medium facing surface and the substrate surface of the magnetic head.

The magnetic head 50 shown in FIGS. 2 and 3
A substrate 1 made of a ceramic material such as AlTiC (Al ₂ O ₃ .TiC); an insulating layer 2 made of an insulating material such as alumina (Al ₂ O ₃ ) formed on the substrate 1;
A lower shield layer 3 made of a magnetic material and formed on the insulating layer 2, and an insulating layer 4 on the lower shield layer 3.
And an upper shield layer 6 made of a magnetic material and formed on the MR element 5 with an insulating layer 4 interposed therebetween. The portion from the lower shield layer 3 to the upper shield layer 6 becomes a reproducing head.

One end of the MR element 5 is connected to the medium facing surface ABS.
Are located in As the MR element 5, an element using a magnetosensitive film exhibiting a magnetoresistance effect, such as an AMR (anisotropic magnetoresistance effect) element, a GMR (giant magnetoresistance effect) element, or a TMR (tunnel magnetoresistance effect) element is used. be able to.

The magnetic head 50 shown in FIGS. 2 and 3
Further, an insulating layer 7 made of an insulating material, formed on the upper shield layer 6, a thin-film coil 8 formed on the insulating layer 7, and an insulating layer made of an insulating material covering the thin-film coil 8 Layer 9 and magnetic pole 1 formed on insulating layer 9.
0 and a protective layer 11 made of an insulating material covering the magnetic pole 10
And The portion from the upper shield layer 6 to the magnetic pole 10 becomes a recording head. In the ABS facing the medium, the upper shield layer 6 and the magnetic pole 10 are separated by the insulating layers 7 and 9. The magnetic pole 10 corresponds to the main magnetic pole of the recording head, and the upper shield layer 6 also serves as the auxiliary magnetic pole of the recording head.

In the insulating layer 7, a contact hole 7a is formed at a position away from the medium facing surface ABS. One end of the magnetic pole 10 is arranged on the medium facing surface ABS. The magnetic pole 10 is magnetically connected to the upper shield layer 6 via a contact hole 7a at a position away from the medium facing surface ABS. The thin film coil 8
It is wound around the connection between the magnetic pole 10 and the upper shield layer 6.

In FIG. 2, PW represents the width of the magnetic pole 10 in the medium facing surface ABS (hereinafter referred to as magnetic pole width).
PL represents a length in a direction orthogonal to the width direction of the magnetic pole 10 on the medium facing surface ABS (hereinafter, referred to as a magnetic pole length).

In the magnetic head 50 shown in FIGS. 2 and 3, the thin-film coil 8 is supplied with a current according to the information to be recorded on the recording medium, and generates a magnetic field according to the information to be recorded. The magnetic pole 10 and the upper shield layer 6 allow a magnetic flux corresponding to the magnetic field generated by the thin-film coil 8 to pass. The magnetic pole 10 generates a magnetic field for recording information on a recording medium, that is, a magnetic field including a component in a direction perpendicular to the surface of the recording medium, from one end disposed on the medium facing surface ABS. When the single pole head shown in FIGS. 2 and 3 is used, it is preferable to use a two-layer medium as the recording medium.

In the magnetic head 50 shown in FIGS. 4 and 5, the configuration from the substrate 1 to the upper shield layer 6 is as follows.
This is the same as the magnetic head 50 shown in FIGS.
The magnetic head 50 shown in FIGS. 4 and 5 further includes an insulating layer 7 made of an insulating material formed on the upper shield layer 6 and a thin-film coil 8 formed on the insulating layer 7.
And an insulating layer 9 made of an insulating material covering the thin-film coil 8.
And a magnetic pole 10 formed on the insulating layer 9, and a protective layer 11 made of an insulating material that covers the magnetic pole 10. The portion from the upper shield layer 6 to the magnetic pole 10 becomes a recording head.

In the magnetic head 50 shown in FIGS. 4 and 5, unlike the magnetic head 50 shown in FIGS. 2 and 3, an insulating layer is provided on the insulating layer 7 near the medium facing surface ABS. 9 is not formed, and the magnetic pole 10 faces the upper shield layer 6 via the insulating layer 7 serving as a gap. Further, as shown in FIG. 4, the medium facing surface AB
In the vicinity of S, the width of a part of the magnetic pole 10, the insulating layer 7, and the upper shield layer 6 is uniform.

In the insulating layer 7, a contact hole 7a is formed at a position away from the medium facing surface ABS. The magnetic pole 10 is provided at a position distant from the medium facing surface ABS through a contact hole 7a.
Are magnetically connected to The thin-film coil 8 has a magnetic pole 10
And the upper shield layer 6.

As in FIG. 2, in FIG. 4, PW represents the magnetic pole width of the magnetic pole 10 at the medium facing surface ABS, and PL represents the magnetic pole length of the magnetic pole 10 at the medium facing surface ABS.

In the magnetic head 50 shown in FIGS. 4 and 5, the thin film coil 8 is supplied with a current corresponding to information to be recorded on the recording medium, and generates a magnetic field according to the information to be recorded. The magnetic pole 10 and the upper shield layer 6 allow a magnetic flux corresponding to the magnetic field generated by the thin-film coil 8 to pass. This magnetic flux leaks from a gap between the magnetic pole 10 and the upper shield layer 6 in the medium facing surface ABS, and thereby a magnetic field for recording information on the recording medium, that is, a component in a direction perpendicular to the surface of the recording medium. Is generated. When the ring head shown in FIGS. 4 and 5 is used, a single-layer medium may be used as a recording medium,
A two-layer medium may be used.

In this embodiment, as described above, the magnetic pole 1
The magnetic pole width PW of 0 is the period TP of the track 20 of the recording medium.
Is bigger than. Further, as shown in FIGS. 2 and 4, the magnetic pole length PL of the magnetic pole 10 is preferably smaller than the magnetic pole width PW. The width of the MR element 5 is substantially equal to the width TW of the track 20. Also, magnetic pole 1
The center position in the width direction of 0 is offset from the center position in the width direction of the MR element 5 to one side in the width direction of the magnetic pole 10 by a distance of about half of the period TP of the track 20. .

Next, a magnetic recording / reproducing apparatus according to this embodiment will be described with reference to FIG. This magnetic recording / reproducing apparatus includes the magnetic recording apparatus according to the present embodiment. The magnetic recording / reproducing apparatus includes a plurality of disk-shaped recording media 30 arranged in parallel at a predetermined interval from each other, a spindle 41 that penetrates the center of these recording media 30, and rotates the recording media 30, A spindle motor 42 for rotating the spindle 41 and a spindle motor driver 43 for driving the spindle motor 42 are provided. The recording medium 30 has magnetic recording layers on both sides. Each magnetic recording layer is formed with a plurality of circular tracks arranged at a predetermined period. By rotating the spindle 41 by the spindle motor 42, the plurality of recording media 30 are rotated at the same rotation speed.

The magnetic recording / reproducing apparatus further includes a recording medium 3
0, a plurality of magnetic heads 50 arranged so as to face the magnetic recording layers on both surfaces, a suspension 51 having the respective magnetic heads 50 mounted at the tip, and a rotary actuator 52 having the bases of these suspensions 51 mounted. And a voice coil motor (hereinafter referred to as VCM) 5 for rotating the rotary actuator 52.
3 and a VCM driver 54 for driving the VCM 53. The magnetic head 50 has, for example, the configuration shown in FIGS. 2 and 3 or the configuration shown in FIGS.

The magnetic recording / reproducing apparatus further includes a recording / reproducing circuit 55 connected to each magnetic head 50, and a control circuit 56 for controlling the spindle motor driver 43, the VCM driver 54 and the recording / reproducing circuit 55. When recording information on the recording medium 30, the recording / reproducing circuit 55
The information to be recorded is modulated to generate a recording current, and the recording current is supplied to the thin-film coil 8 of the magnetic head 50. Also,
When reproducing the information recorded on the recording medium 30, the recording / reproducing circuit 55 receives an output signal of the MR element 5 of the magnetic head 50, demodulates the signal, and reproduces the information. The control circuit 56 is constituted by, for example, a microprocessor.

In this magnetic recording / reproducing apparatus, the magnetic head 5
By rotating the recording medium 30 with the recording head 30 facing the recording medium 30, the magnetic head 5 with respect to the recording medium 30 is rotated.
The position of 0 is moved in the direction along the track. The spindle 41, the spindle motor 42, and the spindle motor driver 43 correspond to a first moving unit in the present invention. Further, in this magnetic recording / reproducing apparatus, the suspension 51 is rotated by the rotary actuator 52 to move the magnetic head 50 in the track traverse direction of the recording medium 30. Suspension 51,
Rotary actuator 52, VCM 53 and VC
The M driver 54 corresponds to a second moving unit in the present invention. Further, the control circuit 56 corresponds to the control means in the present invention.

FIG. 7 shows a recording area on one side of the recording medium 30. The recording medium 30 includes a plurality of tracks arranged side by side and has a continuous recording area 31 in which information is continuously recorded in the plurality of tracks and a single recording area 32 in which information is recorded in units of one track. are doing. The continuous recording area 31 mainly records a large amount of information such as image information. In the single recording area 32, information having a relatively small capacity such as file management information and document information is recorded. A plurality of continuous recording areas 31 may be provided. The cycle of the track in the single recording area 32 is twice the cycle TP of the track 20 in the continuous recording area 31.

Next, the operation of the magnetic recording / reproducing apparatus according to this embodiment will be described. The following description also serves as a description of the magnetic recording method according to the present embodiment.

First, the operation of the magnetic recording / reproducing apparatus when recording information in the continuous recording area 31 of the recording medium 30 will be described with reference to FIG. FIG. 8 shows two adjacent continuous recording areas 31 among a plurality of continuous recording areas 31 by reference numerals 31A and 31B, respectively. A non-recording area 35 having a width equal to or larger than the difference between the magnetic pole width PW of the magnetic pole 10 and the width TW of the track 20 is formed between two adjacent continuous recording areas 31A and 31B. No valid information is recorded in the non-recording area 35. In FIG. 8, the width of the non-recording area 35 is set equal to the period TP of the track 20.

For example, when recording information in the continuous recording area 31A of the recording medium 30, the control circuit 56 controls the spindle motor driver 43, V, so that the following operation is performed.
The CM driver 54 and the recording / reproducing circuit 55 are controlled.
In the continuous recording area 31A, recording is started from the track 20 at one end (hereinafter, referred to as the first track 20) in the continuous recording area 31A. First, the head 50
The magnetic head 50 is positioned on the first track 20 in the continuous recording area 31A, the position of the magnetic head 50 with respect to the recording medium is moved in a direction along the track 20, and recording on the first track 20 is performed. When information is recorded in the continuous recording area 31A, the position of the center of the magnetic pole 10 in the width direction is set at a distance of about half the period TP of the track 20 from the position of the center of the track 20 in the width direction. 10 are arranged on one side in the width direction.

When the recording on the first track 20 is completed, the magnetic head 50 is moved by the period TP of the track 20, and the recording on the track 20 adjacent to the first track is performed in the continuous recording area 31A. Hereinafter, the same operation is repeated, and finally, the continuous recording area 3
Recording is performed on the other track 20 (hereinafter, referred to as the last track 20) in 1A, and the recording operation in the continuous recording area 31A ends.

FIG. 8 shows a state where recording is performed on the last track 20 in the continuous recording area 31A. When information is recorded on the last track 20, the same information is also written in the non-recording area 35. However, since the adjacent continuous recording areas 31A and 31B are arranged at intervals of the width of the non-recording area 35, the writing of information to the non-recording area 35 is performed by the information recorded in the continuous recording area 31B. Does not affect

As described above, by continuously recording information over a plurality of tracks 20 in the continuous recording area 31A, information can be recorded for each track. Another continuous recording area 31 such as the continuous recording area 31B
Is the same. When a series of information to be recorded does not fit in the continuous recording area 31A, the recording operation is continued in another continuous recording area 31, for example, the continuous recording area 31B.

If the capacity of the information to be recorded does not become an integral multiple of one or more of the recording capacity of the continuous recording area 31, information is not recorded in a part of one continuous recording area 31. , That area is wasted. However, large-capacity information such as moving image information is usually recorded over hundreds to thousands of tracks. Therefore, in particular, when the magnetic recording / reproducing apparatus according to the present embodiment is used for recording such a large amount of information, the useless area generated in one continuous recording area 31 is recorded on the recording medium 30. Is small in view of the total recording capacity of

Next, the operation of the magnetic recording / reproducing apparatus when recording information in the single recording area 32 of the recording medium 30 will be described with reference to FIG. The control circuit 56 controls the single recording area 3
When information is recorded in the VCM driver 5, the spindle motor driver 43 and the VCM driver 5 perform the following operations.
4 and the recording / reproducing circuit 55 are controlled. That is, in the single recording area 32, the magnetic head 50 is positioned on a desired track 26 in the single recording area 32, the position of the magnetic head 50 with respect to the recording medium is moved in a direction along the track 26, and the recording on the track 26 is performed. Is performed. As described above, the track 2 in the single recording area 32
The period of 6 is twice the period TP of the track 20 in the continuous recording area 31. In the case where information is to be recorded on another track 26 in the single recording area 32, the magnetic head 50 is moved with the cycle of the track 26, that is, TP × 2 as one unit, and is positioned on the other track 26. Recording on the track 26 is performed. By such an operation, information can be recorded in the single recording area 32 without erasing information on the tracks 26 other than the track 26 on which recording is performed.

In the single recording area 32, the period is TP ×
Instead of providing two tracks 26, a plurality of tracks 20 having a period of TP may be provided similarly to the continuous recording area 31, and recording may be performed every other track in the single recording area 32. Also in this case, information can be recorded in the single recording area 32 without erasing information on the tracks 20 other than the track 20 on which recording is performed.

The recording medium 30 includes the recording medium 3
Servo information as positioning information used for positioning the magnetic head 50 with respect to 0 is recorded in advance. The period of the servo track where the servo information is recorded is
For example, it is 1/2 to 1/4 of the period TP of the track 20 on which data is recorded. Therefore, it is difficult to record servo information on the recording medium 30 with high density using the magnetic head 50 according to the present embodiment in which the magnetic pole width PW is larger than the period TP of the track 20. However, for example, JP-A-200
By using a method of recording servo information by magnetic transfer as disclosed in Japanese Patent Application Publication No. 0-339681, servo information can be recorded on the recording medium 30 in advance. Alternatively, as the recording medium 30, for example, JP-A-9-167
As disclosed in JP-A-336, a recording medium in which a hard magnetic layer constituting a servo pattern is physically embedded in advance may be used. For example, the servo information is recorded in advance on the recording medium 30 using these methods, so that the servo information can be recorded on the recording medium 30 using the magnetic head 50.
This makes it possible to avoid difficulties in recording at high density.

Next, the effects of this embodiment will be described with reference to FIGS. FIG. 10 shows an example of the relationship between the magnetic pole width PW and the magnetic pole length PL of the magnetic pole of the magnetic head, and the intensity Hy of the vertical component of the magnetic field generated by the magnetic pole. As can be seen from FIG. 10, the intensity Hy of the vertical component of the magnetic field decreases as the cross-sectional area (PL × PW) of the magnetic pole decreases. On the other hand, when information is recorded on the recording medium by the perpendicular magnetic recording method, the intensity Hy of the perpendicular component of the magnetic field is preferably at least twice the coercive force Hc of the recording medium. In the example shown in FIG. 10, the coercive force Hc of the recording medium is 4000 Oe (= 4000 × 79 A / m), and the required strength Hy is 8000 Oe (= 8000 × 79).
A / m) and the magnetic pole length PL of the magnetic pole is 0.2 μm, the lower limit of the magnetic pole width PW of the magnetic pole is about 0.08 μm. In the conventional magnetic recording / reproducing apparatus, since the track width TW of the recording medium is equal to the magnetic pole width PW, in the above case, the lower limit of the track width TW is also about 0.08 μm. Therefore, due to the limit of the track width TW, the improvement of the areal recording density in the recording medium reaches the limit.

While maintaining the required strength Hy, the magnetic pole width P
In order to reduce W, it is conceivable to increase the magnetic pole length PL. However, when the magnetic pole length PL is increased, adverse effects due to skew, that is, overwriting on adjacent tracks, occur.

On the other hand, according to the present embodiment, the magnetic pole width PW of the magnetic pole 10 is made larger than the period TP of the track 20 of the recording medium 30, so that the intensity of the magnetic field generated by the magnetic pole 10 is prevented from lowering. While the track width TW is reduced, the track density is improved, and the areal recording density on the recording medium 30 can be improved. For example, the magnetic pole width P
When W is set to 0.08 μm as in the above-described example, in the present embodiment, the track width TW is set to about 1 / the magnetic pole width PW.
2, ie about 0.04 μm. As described above, according to the present embodiment, the recording medium 3 is prevented from being reduced in intensity of the magnetic field generated from the magnetic pole 10.
The surface recording density at 0 can be improved, for example, to about twice the conventional value.

The decrease in the magnetic field intensity accompanying the saturation of the magnetic flux becomes remarkable when the magnetic pole width PW becomes 0.2 μm or less.
Therefore, in the related art, when the track width TW is 0.2 μm or less, the magnetic field strength is significantly reduced. On the other hand, according to the present embodiment, the magnetic pole width PW is equal to the track width T.
W, the track width TW is 0.2 μm
Even below, the magnetic pole width PW can be made larger than 0.2 μm to suppress a decrease in magnetic field strength. Therefore, in the present embodiment, the effect becomes remarkable when the track width TW is 0.2 μm or less.

Further, according to the present embodiment, when compared under the same track width TW and the same magnetic pole length PL, the magnetic pole width PW can be made larger than in the prior art. Therefore, according to the present embodiment, it is easy to manufacture the magnetic pole 10 formed by the frame plating method or the dry etching method, and it is possible to improve the production yield of the magnetic head.

Further, according to the present embodiment, it is not necessary to increase the magnetic pole length PL in order to reduce the track width TW while preventing the magnetic field generated from the magnetic pole 10 from decreasing in intensity. Therefore, according to the present embodiment, it is possible to reduce the adverse effect due to the skew. In order to further reduce adverse effects due to skew, the magnetic pole length PL of the magnetic pole 10 is preferably smaller than the magnetic pole width PW.

FIGS. 11 to 13 are explanatory diagrams for explaining the influence of skew when the magnetic pole length PL of the magnetic pole 10 is smaller than the magnetic pole width PW. FIG. 11 to FIG.
It shows the positional relationship between the track 20 and the magnetic pole 10 when the skew angles θs are 0 °, −15 °, and 15 °, respectively. When comparing FIGS. 11 to 13 with FIGS. 17 to 19, it is apparent that the magnetic pole length PL of the magnetic pole 10 is changed to the magnetic pole width P.
It can be seen that by making it smaller than W, overwriting on the adjacent track 20 can be prevented.

In particular, in a perpendicular magnetic recording system using a two-layer medium, the magnetic pole length PL of the magnetic pole 10 is determined by the magnetic pole width PW.
By making it smaller, a curved residual magnetization pattern generated near the edge of the track 20 when skew occurs can be reduced. Thereby, the quality of the information recorded on the recording medium 30 can be improved.

According to the present embodiment, the recording medium 3
Since the continuous recording area 31 and the single recording area 32 are provided in 0, large-capacity information can be recorded in the continuous recording area 31 and small-capacity information can be efficiently recorded in the single recording area 32. Can be.

According to the present embodiment, the recording medium 3
0 has magnetic anisotropy in which the axis of easy magnetization is oriented in a direction perpendicular to the surface of the recording medium 30, so that information is recorded on the recording medium 30 by using the perpendicular magnetic recording method.
It is possible to improve the linear recording density at 0.

The present invention is not limited to the above embodiment, and various changes can be made. For example, in the embodiment, the example in which the magnetic pole width PW of the magnetic pole 10 is set to about twice the period TP of the track 20 has been described, but the magnetic pole width PW of the magnetic pole 10 may be larger than the period TP of the track 20.

Further, in the embodiment, the example in which the present invention is applied to the perpendicular magnetic recording system has been described, but the present invention can also be applied to the longitudinal magnetic recording system. In this case, as the magnetic head 50, for example, the ring head shown in FIGS. 4 and 5 can be used. In this case, the recording medium 30 has an easy axis of magnetization.
It is preferable to use a material having a magnetic anisotropy oriented in a direction parallel to the surface.

[0085]

As described above, according to the magnetic head according to any one of the first to fourth aspects, the width of one end of the magnetic pole on the medium facing surface is larger than the track period of the magnetic recording medium. In addition, the track width can be reduced to improve the areal recording density of the recording medium while preventing the strength of the magnetic field generated from the magnetic pole from lowering, and the magnetic pole can be easily formed.

According to the magnetic head of the present invention, since the length of the one end of the magnetic pole in the direction perpendicular to the width direction is smaller than the width of the one end, the influence of skew can be reduced. It works.

Further, according to the magnetic head of the third aspect, the effect is particularly remarkable since the track period is 0.2 μm or less.

According to the magnetic recording device of the present invention, the width of one end of the magnetic pole on the medium facing surface is made larger than the track period of the magnetic recording medium, so that the magnetic pole is generated from the magnetic pole. While preventing a decrease in the strength of the applied magnetic field, the track width can be reduced to improve the areal recording density on the recording medium, and the magnetic pole can be easily formed.

According to the magnetic recording apparatus of the sixth aspect, the length of the one end of the magnetic pole in the direction orthogonal to the width direction is smaller than the width of the one end, so that the influence of skew can be reduced. This has the effect.

According to the magnetic recording apparatus of the present invention, the effect is particularly remarkable because the track period is 0.2 μm or less.

According to the magnetic recording apparatus of the ninth to twelfth aspects, the recording medium includes a plurality of tracks that are arranged side by side, and information is continuously recorded on the plurality of tracks. Having a recording area,
When recording information in the continuous recording area, the control means controls the second position of the magnetic head with respect to the magnetic recording medium in the cross-track direction by a period of the track.
Is controlled, the information can be recorded on each track in the continuous recording area.

Further, according to the magnetic recording apparatus of the tenth aspect, the recording medium has a plurality of continuous recording areas arranged at intervals larger than the difference between the width of one end of the magnetic pole and the width of the track. Therefore, in each continuous recording area, information can be recorded without erasing information recorded in other areas.

Further, according to the magnetic recording apparatus of the present invention, the recording medium is not only a continuous recording area but also a recording medium.
It has a single recording area in which information is recorded in track units, so that large-capacity information can be recorded in a continuous recording area and small-capacity information can be efficiently recorded in a single recording area. It works.

According to the magnetic recording apparatus of the twelfth aspect, when recording information in the single recording area, the control means sets the position of the magnetic head with respect to the magnetic recording medium in the track traversal direction to the position of the magnetic pole. One distance greater than the width of one end
Since the second moving means is controlled so as to move as a unit, information in tracks other than the track on which recording is performed is not erased in the single recording area.
There is an effect that information can be recorded.

According to the magnetic recording device of the present invention, the magnetic recording medium has magnetic anisotropy in which the axis of easy magnetization is perpendicular to the surface of the magnetic recording medium. Recording information on the magnetic recording medium by using the recording medium, thereby improving the linear recording density of the magnetic recording medium.

According to the magnetic recording device of the present invention, since the positioning information used for positioning the magnetic head with respect to the magnetic recording medium is recorded in the magnetic recording medium in advance, the magnetic recording medium is used. Thus, it is possible to avoid the difficulty in recording the positioning information at a high density.

According to the magnetic recording method of the present invention, the width of one end of the magnetic pole on the medium facing surface is made larger than the track period of the magnetic recording medium. While preventing a decrease in strength, the track width can be reduced to improve the areal recording density in the recording medium, and the magnetic pole can be easily formed.

According to the magnetic recording method of the sixteenth aspect, the effect is particularly remarkable since the track period is 0.2 μm or less.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a positional relationship between a magnetic pole of a magnetic head and a track of a magnetic recording medium according to an embodiment of the present invention.

FIG. 2 is a front view showing a medium facing surface in an example of a magnetic head according to an embodiment of the present invention.

FIG. 3 is a sectional view of the magnetic head shown in FIG. 2;

FIG. 4 is a front view showing a medium facing surface in another example of the magnetic head according to one embodiment of the present invention.

FIG. 5 is a sectional view of the magnetic head shown in FIG. 4;

FIG. 6 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a recording area on one side of a recording medium according to an embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining an operation of the magnetic recording and reproducing apparatus shown in FIG. 7 when information is recorded in a continuous recording area of a recording medium.

FIG. 9 is an explanatory diagram for explaining an operation of the magnetic recording / reproducing apparatus shown in FIG. 7 when recording information in a single recording area of a recording medium.

FIG. 10 shows a magnetic pole width and a magnetic pole length of a magnetic pole of a magnetic head;
FIG. 9 is a characteristic diagram illustrating an example of a relationship between a magnetic field generated by a magnetic pole and the intensity of a vertical component.

FIG. 11 is an explanatory diagram showing a positional relationship between a track and a magnetic pole when a skew angle is 0 ° in one embodiment of the present invention.

FIG. 12 is an explanatory diagram illustrating a positional relationship between a track and a magnetic pole when a skew angle is −15 ° in one embodiment of the present invention.

FIG. 13 is an explanatory diagram showing a positional relationship between a track and a magnetic pole when a skew angle is 15 ° in one embodiment of the present invention.

FIG. 14 is a front view showing a medium facing surface in an example of a single-pole magnetic head for a perpendicular magnetic recording system.

FIG. 15 is an explanatory diagram showing a positional relationship between magnetic poles of the magnetic head and tracks of a recording medium when recording information using the magnetic head shown in FIG.

FIG. 16 is an explanatory diagram for describing skew.

FIG. 17 is an explanatory diagram showing a positional relationship between a track and a magnetic pole when the skew angle is 0 °.

FIG. 18 is an explanatory diagram illustrating a positional relationship between a track and a magnetic pole when the skew angle is −15 °.

FIG. 19 is an explanatory diagram showing a positional relationship between a track and a magnetic pole when the skew angle is 15 °.

[Explanation of symbols]

3 lower shield layer, 4 insulating layer, 5 MR element, 6
Upper shield layer, 7 insulating layer, 8 thin film coil, 9 insulating layer, 10 magnetic pole, 20 track, 30 magnetic recording medium, 31 continuous recording area, 32 single recording area, 41 spindle, 42 ... Spindle motor, 43 ... Spindle motor driver, 50 ... Magnetic head, 51 ... Suspension, 52 ... Rotary actuator, 53 ... VC
M, 54: VCM driver, 55: recording / reproducing circuit, 56
... Control circuit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 5/31 G11B 5/31 K 5/596 5/596 21/10 21/10 NF term (reference) 5D033 AA05 BA12 BB43 CA01 5D042 LA03 MA15 5D091 AA10 CC11 CC12 GG33 5D093 AA05 AB03 AD12 AE05 BD01 BE05 BE15 EA02 5D096 NN07

Claims (16)

[Claims] 1. A magnetic head for recording information on a disk-shaped magnetic recording medium having a plurality of circular tracks arranged at a predetermined period, the medium facing surface facing the magnetic recording medium. And a coil for generating a magnetic field according to information to be recorded on the magnetic recording medium, and one end disposed on the medium facing surface, and passing a magnetic flux corresponding to the magnetic field generated by the coil, A magnetic pole for generating a magnetic field from the one end for recording the information on a magnetic recording medium, wherein a width of the one end of the magnetic pole is larger than a track period of the magnetic recording medium. head. 2. The magnetic head according to claim 1, wherein a length of one end of the magnetic pole in a direction orthogonal to a width direction is smaller than a width of the one end. 3. The magnetic head according to claim 1, wherein a period of the track is 0.2 μm or less. 4. The magnetic head according to claim 1, further comprising a reproducing element for reproducing information recorded on the magnetic recording medium. 5. A disk-shaped magnetic recording medium having a plurality of circular tracks arranged at a predetermined cycle; a magnetic head for recording information on the magnetic recording medium; First moving means for moving the position of the magnetic head in a direction along the track; second moving means for moving the position of the magnetic head with respect to the magnetic recording medium in the cross-track direction; A magnetic recording apparatus comprising: a moving unit; and a control unit that controls a second moving unit, wherein the magnetic head includes: a medium facing surface facing the magnetic recording medium; and information to be recorded on the magnetic recording medium. And a coil for generating a magnetic field corresponding to the magnetic field, and one end disposed on the medium facing surface, allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass therethrough, and A magnetic pole for generating a magnetic field from the one end for recording information on the magnetic recording medium, wherein the width of the one end of the magnetic pole is larger than the track period of the magnetic recording medium. . 6. The magnetic recording apparatus according to claim 5, wherein a length of the one end of the magnetic pole in a direction orthogonal to a width direction is smaller than a width of the one end. 7. The magnetic recording apparatus according to claim 5, wherein a period of the track is 0.2 μm or less. 8. The magnetic recording according to claim 5, wherein the magnetic head further comprises a reproducing element for reproducing information recorded on the magnetic recording medium. apparatus. 9. The recording medium includes a plurality of tracks arranged side by side, and has a continuous recording area in which information is continuously recorded on the plurality of tracks. The control unit stores the information in the continuous recording area. 6. The method according to claim 5, wherein when recording is performed, the second moving means is controlled such that a position of the magnetic head with respect to the magnetic recording medium moves by a period of a track in a track crossing direction. 9. The magnetic recording device according to any one of items 8. 10. The recording medium according to claim 9, wherein said recording medium has a plurality of said continuous recording areas which are arranged with an interval larger than a difference between a width of one end of said magnetic pole and a width of a track. Magnetic recording device. 11. The magnetic recording apparatus according to claim 9, wherein the recording medium further has a single recording area in which information is recorded in one track unit. 12. When recording information in the single recording area, the control means may determine that a position of the magnetic head with respect to the magnetic recording medium is a distance equal to or greater than a width of one end of the magnetic pole in a track transverse direction. 12. The magnetic recording apparatus according to claim 11, wherein the second moving unit is controlled so as to move as a unit. 13. The magnetic recording apparatus according to claim 5, wherein the magnetic recording medium has magnetic anisotropy in which an easy axis is oriented in a direction perpendicular to a surface of the magnetic recording medium. apparatus. 14. The magnetic recording medium according to claim 5, wherein positioning information used for positioning the magnetic head with respect to the magnetic recording medium is recorded in advance. Magnetic recording device. 15. A coil having a medium facing surface facing a magnetic recording medium, a coil for generating a magnetic field according to information to be recorded on the magnetic recording medium, and one end disposed on the medium facing surface. And a magnetic pole having a magnetic pole for generating a magnetic field for recording the information on a magnetic recording medium from the one end portion while passing a magnetic flux corresponding to the magnetic field generated by the magnetic head. Recording information on a disk-shaped magnetic recording medium having a plurality of circular tracks, wherein, as the magnetic head, a width of one end of the magnetic pole is larger than a track period of the magnetic recording medium. Using a magnetic head to record information on one track while moving the position of the magnetic head with respect to the magnetic recording medium in a direction along the track; That procedure being performed alternately with the magnetic recording said cycle of track position of the magnetic head in the track crossing direction with respect to the medium, a magnetic recording method characterized by comprising the steps of moving. 16. The magnetic recording method according to claim 15, wherein a period of said track is 0.2 μm or less.