JPS59144003A - Vertical magnetic recording system - Google Patents

Abstract

PURPOSE:To attain the recording and reproducing with high accuracy and high density by forming a perfect closed magnetic path after performing the recording and reproducing with a direct contact secured between a magnetic flux converging magnetic pole of a vertical magnetic recording head and an exposed part of a magnetic layer of high permeability of a vertical magnetic recording medium. CONSTITUTION:A recording magnetic pole 1a of a head 1'' is set opposite to the surface of a vertically magnetized layer 3a' of a recording medium 3' (disk type medium). While, a contact is secured between the exposed part of a magnetic layer 3b of high permeability of the medium 3' and at least a part of a magnetic flux converging magnetic pole 1b'' of the head 1''. Then the medium 3' is revolved toward an arrow 5. Then the magnetic pole 1a is slid as shown by an arrow 6 in the direction where the pole 1a crosses the traveling direction of the medium 3' so as to change the track position. At the same time, a recording current is flowed to a coil 2 of the head 1''. As a result, a magnetic flux 4'' forms a closed magnetic path as shown by a broken line arrow to ensure the vertical magnetization for recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a perpendicular magnetic recording system particularly suitable for high-density recording and human life.

The conventional perpendicular magnetic recording system is an ideal system that enables higher density recording than the commonly used horizontal magnetic recording system, and also has the advantage that the magnetic arrangement medium can be stably magnetized without being subjected to a demagnetizing field. It is known as a typical recording method. There are two types of perpendicular magnetic recording methods depending on the type of perpendicular magnetic recording head used. As shown in Figure 1, one is a headless system in which the recording magnetic pole 1a and the magnetic flux convergence magnetic pole 1b (around which the coil 2 is wound) are separated; As shown in the figure, the recording magnetic pole 1a and the magnetic flux convergence magnetic pole 1b' are connected to the core io (
The head 1' is connected with a coil 2 wound around this
This method uses In the head used in either method, the recording magnetic pole 1 m is made by forming a high permeability magnetic thin film such as permalloy on a non-fractureable support such as a glass plate, and the magnetic flux convergence magnetic pole 1 b' The core IC is made of a high permeability magnetic material such as Mn-Zn ferrite.

In this way, the system shown in FIG.
Both sides of the perpendicular magnetic recording medium 3 (having a high magnetic permeability magnetic layer 3b such as permalloy and perpendicular magnetization 1-3a such as Co-Cr alloy on a non-magnetic support 3C such as a polyester film) are On the other hand, in the method shown in FIG. 2, both magnetic poles 1a and lb' of the head 1' are placed on one side of the perpendicular magnetic recording medium 3 to perform recording. When recording (or reproducing), recording medium 3
is made to run in the direction of the solid arrow. Here, in the recording method of the method shown in FIG. 1, by passing a recording signal current through the coil 2, the magnetic flux converging magnetic pole 1b is first excited in accordance with this current, and the magnetic flux 4 causes the recording magnetic pole 1a to be excited. magnetized,
Furthermore, the magnetic flux 4 causes the perpendicular magnetization layer 3 & of the recording medium 3 to be magnetized in the perpendicular direction. However, with this method, 1) the circuit through which the magnetic flux passes is an open magnetic path as a whole, which increases the magnetic resistance of the circuit and reduces the sensitivity of the head, making it impossible to obtain high reproduction output; The N ratio also gets worse. 2) Both magnetic poles of head 1 are 1m, 1bl'1Jj
Since the K recording medium 3 is sandwiched between the magnetic poles, it is difficult to align the magnetic poles, and if a thick recording medium is used, the recording and reproducing efficiency of the head decreases. On the other hand, the method shown in Fig. 2 was devised to improve these drawbacks, and the recording principle of this method is that by passing a recording signal current through the coil 2, the core IC section is first The recording magnetic pole 1m is magnetized by the magnetic flux 4', and the perpendicular magnetic layer 3 of the recording medium 3 is further magnetized in the perpendicular direction by the magnetic flux 4'. Note that the magnetic flux 4' then forms a closed path passing through the high permeability magnetic layer 3b, the vertical s-layer 3M-, and the flux converging magnetic pole 1b' in this order.

However, in this method, when the magnetic flux 4' goes from the high permeability magnetic layer 3b to the perpendicular magnetization layer 3a, most of the magnetic flux 4' passes through the high permeability magnetic layer 3b.
A complete closed magnetic path cannot be formed because the magnetic flux escapes toward . That is, since the magnetic flux 4' generated in the recording magnetic pole 11 leaks onto the recording medium 3, it has been impossible to improve the recording/reproducing efficiency and the S/N ratio.

Purpose The purpose of the present invention is to particularly improve the perpendicular magnetic recording method shown in Figure 2, and to achieve high-density recording with improved recording and reproducing efficiency and S/N ratio by forming a completely closed magnetic path during recording and reproducing. An object of the present invention is to provide a perpendicular magnetic recording system that allows recording and reproduction.

The perpendicular magnetic recording method of the present invention is a perpendicular magnetic recording medium in which a high permeability magnetic layer is provided on at least one surface of a non-magnetic support and a perpendicular magnetic layer K is provided on most of the surface of this magnetic layer. The other end of the core having a recording magnetic pole is slidably attached to the magnetic flux converging magnetic pole so that the recording magnetic pole of the perpendicular magnetic recording head faces the exposed portion of the high permeability magnetic layer of the recording medium. After bringing at least a portion of the magnetic flux converging magnetic pole into contact, the recording medium is caused to run, and then the recording magnetic pole of the head is slid in a direction 5- that intersects with the running direction of the recording medium, and the magnetic pole is brought into contact with the recording medium. This feature is characterized by recording.

As described above, the perpendicular magnetic recording medium and the perpendicular magnetic recording head used in the present invention are different in shape or structure from conventional ones. In other words, the difference between these is that in the case of perpendicular magnetic recording media, a small portion of the surface of the high permeability magnetic layer is exposed, and in the case of perpendicular magnetic recording heads, the end of the core without the recording magnetic pole is slidable ( Additionally, the recording magnetic pole is attached onto the slidable K)6B flux convergence magnetic pole. An example of a perpendicular magnetic recording medium actually used in the present invention is shown in FIGS. 3(1), (b) and 4(
a), (b) K is shown. In addition, Fig. 3 (a) and Fig. 4 (
1) is a side view, and FIGS. 3(b) and 4(b) are plan views. In the figure, 3' is a perpendicular magnetic recording medium consisting of a perpendicular magnetic layer 311', a high permeability magnetic layer 3b, and a nonmagnetic support 3c. As can be seen from these figures, Figure 3 is an example of a case where it is used in a disk shape such as a flexible disk, and Figure @4 is an example of a case where it is used in a disk shape such as a flexible disk.
- This is an example in which the high permeability magnetic layer 3b is used in the form of a tape in the case of FIG. 3 at the edge on the center hole side, and in the case in FIG. 4 at one edge in the width direction. are calculated respectively. On the other hand, an example of a perpendicular magnetic recording head used in the present invention is shown in FIGS. 5 and 6. In the figure, 1' is the recording magnetic pole 1a
s@A perpendicular magnetic recording head consisting of an east converging magnetic pole 1f and a core i o' wound with a coil 2, where the core 1 c' can slide onto the magnetic flux converging magnetic pole 1 b' at the part d. installed on. Therefore, the recording magnetic pole 11 is also slidable. In addition, the magnetic pole for magnetic flux convergence 1N/
When a flexible disk drive device is used, it can also be used as a clutch plate (a component for rotating the recording medium) of this device. In any case, the perpendicular magnetic recording medium and perpendicular magnetic recording head used in the present invention are not limited to the above examples.

To carry out the method of the present invention using the perpendicular magnetic recording medium and perpendicular magnetic recording head as described above, as shown in FIG. The recording magnetic pole 1m of the head 1' (in this case, the one shown in Fig.
At least a part of the magnetic flux convergence magnetic pole 11/ of the head f is brought into contact with the exposed portion of the magnetic pole 1t/ (in this case, the bottom of the magnetic pole 1t/ is flat, so it comes into close contact), and then the recording medium 3' is caused to run (this 5), then rotate the recording magnetic pole 1a of the head 1' as shown by the arrow 6.
To change the track position, a recording signal current may be applied to the coil 2 of the head 1' while sliding the recording medium 3' in a direction intersecting the running direction of the recording medium 3'. As a result, the magnetic flux l changes from the recording magnetic pole 1a to the perpendicular magnetic layer 3 as shown by the broken arrow.
A closed magnetic path is formed in the order of m'→high permeability magnetism 1 m 3 b −+− flux convergence magnetic pole 1 kF−+: i a 1 a′. Note that when the magnetic flux 1 passes through the perpendicular magnetization N13', this 1- is perpendicularly canned and recorded.

Next, the constituent materials and manufacturing method of the perpendicular magnetic recording medium and perpendicular magnetic recording head used in the present invention will be explained.

First, permalloy (Ni-Fe alloy), Mo-permalloy, Cu-Mo-
A high magnetic permeability s-thin film such as permalloy is used. The perpendicular magnetization layer contains Co-Cr alloy, B&-ferrite, Co-R
Other high permeability magnetic thin films such as u alloy, Co-Ni-P alloy, etc. may be used. Further, as the non-magnetic support, a plastic film (eg, polyester, polyimide, etc. film), a glass plate, a non-magnetic metal plate (eg, Aj, Cu, etc. plate) can be used. Note that both the high permeability magnetic layer and the perpendicular boriding layer can be formed by methods such as vapor deposition and sputtering. In this case, a method such as masking or etching (lift method) may be used to create a desired exposed portion in the high permeability magnetic layer.

On the other hand, a high permeability magnetic thin film similar to the material used for the high permeability magnetic layer is used for the recording magnetic pole of the perpendicular magnetic recording head. These materials are formed into a thin film by vapor deposition, sputtering, etc. on a non-magnetic support such as a glass plate. A high magnetic permeability magnetic material such as Mn-Zn ferrite N1-Zn ferrite is used for the magnetic flux converging magnetic pole and core. Note that when the other end of the core is slidably mounted on the magnetic flux convergence pole, it is desirable to polish both sliding surfaces with high precision in order to bring the two-sided bodies as close as possible.

Effects According to the present invention, the magnetic flux convergence pole of the perpendicular magnetic recording head is brought into direct contact with the exposed portion of the high permeability magnetic layer of the perpendicular magnetic recording medium for recording and reproduction, so that the magnetic flux generated at this time is completely absorbed. A closed magnetic path can be formed. Therefore, it is possible to perform high-precision, high-density recording and reproduction with improved recording and reproduction efficiency and 8/N ratio.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional perpendicular magnetic recording system;
3(a) Jb) and FIGS. 4(a) and (b) are examples of perpendicular magnetic recording media used in the method of the present invention, 10-FIGS. 5 and 6 are examples of perpendicular magnetic recording media used in the method of the present invention. FIG. 7 is an explanatory diagram of the method of the present invention. 1, 1', f... Perpendicular magnetic recording head 1a...
Device magnetic poles lb, tb: it/magnetic flux convergence magnetic poles lc, la'・
...Core 2...Coil 3.3'...Perpendicular magnetic recording medium 3a, 3m'...Perpendicular magnetic layer 3b...High permeability magnetic layer 30...Nonmagnetic support 4, 4', l ... Magnetic flux 5 ... Running direction 6 ... Sliding direction d ... Sliding surface 11- ↓ 12-

Claims (1)

[Claims] 1. A core having a perpendicular magnetic layer K of a perpendicular magnetic recording medium, which has a high permeability magnetic layer on at least one surface of a non-magnetic support and a perpendicular magnetic layer on most of this magnetic layer surface, and a recording magnetic pole at one end. The recording magnetic pole of a perpendicular magnetic recording head, the other end of which is slidably attached to the magnetic flux converging magnetic pole, is opposed to the magnetic flux converging magnetic pole of the head, and the magnetic flux converging magnetic pole of the head is placed in the exposed portion of the high magnetic permeability magnetic layer of the recording medium. After bringing at least a portion into contact, the recording medium is caused to travel, and then recording is performed on the recording medium while sliding a recording magnetic pole of the head in a direction intersecting the traveling direction of the recording medium. Perpendicular magnetic recording method.