JPS6370904A - Vertical magnetic head - Google Patents

Abstract

PURPOSE:To smoothly and safely run a head on a recording medium and to extend the service life of the recording medium by constituting all the contact parts with the recording medium with a self-lubricating material except a main magnetic pole. CONSTITUTION:All the parts contacting the recording medium of the magnetic head except the main magnetic pole is constituted of the self-lubricating material. That, base bodies 11a, 11b sandwiching the main magnetic pole 10 are made of the self-lubricating material, and a thin plate of self-lubricating material 14a, 14b are bonded on the top part of a feed-back magnetic path part i.e. L-shaped high permeability magnetic substance blocks 13a, 13b. As a result, the stable and smooth running of the head on the recording medium is secured while maintaining the excellent performance of the titled head of main magnetic pole exciting type, and moreover, the service life of the recording medium is extended because the medium is not damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a perpendicular magnetic head used in a perpendicular magnetic recording system, and more particularly to a perpendicular magnetic head that can extend the life of a recording medium.

``Conventional technology'' As is well known, recording media such as tapes and disks
In a perpendicular magnetic head that performs magnetic recording in the "thickness direction," a) the recording medium has magnetic perpendicular anisotropy;
The distribution is sharp and a large perpendicular magnetic field can be generated to sufficiently magnetize it.

b) To enable recording on a recording medium with a small magnetomotive force and to extract a large playback output from the recorded recording medium.

is mainly required.

As a device that satisfies such requirements,
A main pole excitation type or an auxiliary pole excitation type perpendicular magnetic head, as seen in Japanese Patent No. 213, has been proposed.

FIG. 12A is a plane view of a conventional main pole excitation type perpendicular magnetic head, and FIG. be. First, a conventional main pole excitation type perpendicular magnetic head will be explained using these drawings.

This perpendicular magnetic head is made of a high magnetic permeability soft magnetic thin film made of Co--Zr or the like, and includes a main magnetic pole 1 whose tip is placed in sliding contact with a magnetic layer of a recording medium RM, and a main magnetic pole 1.
a non-magnetic material 2 that clamps and fixes the magnetic material, a core 3 that is made of a high permeability soft magnetic material block and has a coil 4 wound around its tip, a return path section 5 that forms a magnetic circuit together with the core 3, and a recording medium. It is composed of sliders 6, 6', 6' for ensuring stable running between the RM and the perpendicular magnetic head.

To record a signal on the recording medium RM by this perpendicular magnetic head, an appropriate current is passed through the coil 4 to excite the main magnetic pole 1.
This is done by magnetizing the magnetic layer of the recording medium RM using the strong perpendicular magnetic field of the main magnetic pole 1 generated by this.

On the other hand, reproduction of the signal from the recording medium RM is performed using the recording medium RM.
This is done by magnetizing the main pole 1 by a perpendicular magnetic field from the magnetic layer, and extracting the induced voltage generated in the coil 4 as a signal.

FIG. 13 is a sectional view of a conventional auxiliary pole excitation type perpendicular magnetic head. Next, a conventional auxiliary pole excitation type perpendicular magnetic head will be explained using this drawing. This auxiliary pole excitation type perpendicular magnetic head is made of Ni-Fe5Co-Zr.
- a main magnetic pole 31 made of a high magnetic permeability soft magnetic thin film such as Nb;
An auxiliary magnetic pole 33 made of a high permeability soft magnetic material block and arranged to face the tip of the main magnetic pole 31 with the recording medium RM in between, a coil 34 wound around the auxiliary magnetic pole 33, and a coil 34 wound around the main magnetic pole 31. High permeability magnetic blocks 30a, 308', 30b, 3 that effectively prevent unnecessary magnetization caused by external magnetic fields
0b'.

To record a signal on the recording medium RM by this perpendicular magnetic head, an appropriate current is passed through the coil 34 to excite the auxiliary magnetic pole 33, and the magnetic layer of the recording medium RM is magnetized by the strong perpendicular magnetic field of the main magnetic pole 31 generated thereby. Do by doing. On the other hand, reproduction of the signal from the recording medium RM is performed using the recording medium R.
The magnetism generated in the main magnetic pole 31 by the perpendicular magnetic field from the magnetic layer of M is induced to the auxiliary magnetic pole 33, and thereby the coil 34
This is done by extracting the induced voltage generated in the sensor as a signal.

"Problems to be Solved by the Invention" The perpendicular magnetic heads described above are all extremely effective as perpendicular magnetic heads used in perpendicular magnetic recording systems, but when running continuously for a long time, the recording medium There is a problem in that it can damage the recording medium and shorten its lifespan. In other words, in any of the above perpendicular magnetic heads, the head components made of high magnetic permeability magnetic material that easily damage the recording medium due to sliding contact directly contact the recording medium. It has a contact structure.

Specifically, in the main pole excitation type perpendicular magnetic head shown in FIG.
1 and high permeability soft magnetic material blocks 30a, 30a',
30b, 30b' and the auxiliary magnetic pole 33 are in direct contact with the recording medium RM. In order to obtain high performance as a perpendicular magnetic head, these must be constructed of a high magnetic permeability magnetic material. In addition, in the main pole excitation type perpendicular magnetic head, the contact surface with the recording medium is composed of the return path section 5, the nonmagnetic material 2, and the sliders bSb' and b', which have different material properties. As a result, the recording medium that comes into sliding contact with them is more likely to be damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a perpendicular magnetic head that allows smooth and stable running between the head and a recording medium, and therefore does not damage the recording medium even when running continuously for a long period of time.

"Means for Solving the Problems" In the perpendicular magnetic head of the present invention, the above problems are solved by constructing all the contact parts with the recording medium, except for the main magnetic pole, from a self-lubricating material.

"Example" Next, an example of the perpendicular magnetic head of the present invention will be described.

(First Embodiment) FIG. 1 is a perspective view of a perpendicular magnetic head in a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line nn' in FIG. 1.

The perpendicular magnetic head of this embodiment is a main pole excitation type perpendicular magnetic head, and is composed of the following (a) to (g).

(a) A main magnetic pole 10° made of a high magnetic permeability soft magnetic thin film such as Co-Zr or Co-Zr-Nb (b) A main magnetic pole 10 made of a self-lubricating material such as glassy carbon and clamped and fixed. Base bodies 11a, llb.

(c) A high permeability magnetic block 12 made of a high permeability magnetic material such as Mn-Zn ferrite, whose tip end surface is joined to the bottom end of the main magnetic pole 10 as shown in the figure, and is magnetically coupled to the main magnetic pole 10. (d) A recording/reproducing coil is wound around the tip of the high permeability magnetic block 12 as shown in the figure and is electrically connected to a writing/reading device such as a floppy disk device via a lead wire 21. 20° (e) Substrates 11a and 11b made of a high permeability magnetic material such as Mn-Zn ferrite as shown in the figure.

L-shaped high magnetic permeability magnetic blocks 13a and 13b0, which are joined to the high magnetic permeability magnetic block 12 and constitute a magnetic circuit as a perpendicular magnetic head, are made of a self-lubricating material such as glassy carbon. It is joined to the upper ends of the L-shaped high magnetic permeability magnetic blocks 13a and 13b, and the head
Self-sliding material thin plates 14a, 14b0 that enable smooth and stable running between recording media and greatly contribute to extending the lifespan of the recording media. Slider 15a15b0 made of a lubricating material As described above, in the perpendicular magnetic head of this embodiment, the base bodies 11a and zb that sandwich the main magnetic pole 10 are made of a self-lubricating material, and the return path portion, that is, the L-shaped high permeability magnetic A self-lubricating material thin plate 14-a is attached to the upper end of the body blocks 13a and 13b.
, 14b, while maintaining the excellent performance of the main pole excitation type perpendicular magnetic head, it is possible to cause smooth and stable running between the head and the recording medium, thereby causing damage to the recording medium. This prevents this and extends the lifespan of the recording medium.

Next, an example of the manufacturing procedure of the perpendicular magnetic head of this embodiment will be explained one by one using the exploded assembly diagrams shown in FIGS. 3 and 5.

■First, one surface of the base 11a made of a self-lubricating material such as glassy carbon is polished to a mirror surface, and the main magnetic pole 1 is placed on this polished surface.
Co-Zr or Co Z, r to make it 0
A high permeability soft magnetic material such as Nb is formed into a thin film by sputtering.

(2) After shaping the formed thin film of the main magnetic pole 10 as required (the width of this thin film becomes the so-called track width during recording and reproduction), a base 11b made of the same material and the same shape as the base 11a is placed in such a manner as to sandwich this thin film. It is adhered and fixed to this base 11a.

The main pole sandwiching part composite formed in steps ① and ② in such a manner that the tip end face of the high magnetic permeability magnetic block 12 made of 0Mn-Zn ferrite etc. and one end of the soft magnetic thin film constituting the main pole 10 are in contact with each other. Adhesive country determined.

(2) A recording/reproducing coil 20 is wound around the tip of the high permeability magnetic block 12 (near the main pole sandwiching part) (see FIG. 3).

The side surface (mainly (Thickness direction of the magnetic pole 10) as shown in the figure.

(2) Sliders 15a and 15b made of a self-lubricating material are joined to two sides (in the width direction of the main electrode 10) of the composite body formed in step (2) as shown in the figure (see FIG. 4).

(2) The contact surface of the composite formed in step (2) with the recording medium is ground until the length of the main magnetic pole is approximately 50 to 150 μm.

Furthermore, in order to achieve stable running, a groove 18 is provided in the center of the head, as indicated by a dotted line in the figure.Finally, the ground surface is polished and chamfered so that the ground surface slides stably and smoothly with the recording medium. conduct.

By carrying out the above steps, the perpendicular magnetic head of this embodiment shown in FIGS. 1 and 2 is completed.

By the way, by adding the following improvements to this perpendicular magnetic head, a perpendicular magnetic head having even better performance can be realized.

(Second Embodiment) FIG. 5 is an exploded view of a main pole excitation type perpendicular magnetic head as a second embodiment of this improved station.

In this main pole excitation type perpendicular magnetic head, instead of the sliders 15a and 15b (see FIG. 4) made of a self-lubricating material used in the first embodiment, high magnetic permeability made of Mn-Zn ferrite or the like is used. Magnetic block 16a, 1
6b and self-lubricating material thin plates 17a and 17b. .

Particularly when performing magnetic recording on both sides of a recording medium by using such a slider, FIG. 6 (the sectional view of the head shown here is taken along line BB' in FIG. 1). As shown in the figure, main pole excitation type perpendicular magnetic heads 61 and 62 are arranged with the recording medium RM in between, and the main pole 10 of each main pole excitation type perpendicular magnetic head is
Since the high magnetic permeability magnetic block 16b exists opposite the recording medium RM and the self-lubricating material thin plate 17b,
A closed loop of magnetic flux is formed, so that smooth and stable running between the head and the recording medium is ensured, and recording and reproducing sensitivity can be improved. In particular, the self-lubricating material thin plate 14a
, 14b, 17a, 17b (see Figure 5) have a thickness of 10
When the thickness is 0 μm or less, a high-performance perpendicular magnetic head with excellent recording and reproducing sensitivity can be obtained.

(Third Embodiment) Next, an auxiliary pole excitation type perpendicular magnetic head will be described as a third embodiment of the present invention.

FIG. 7 is a perspective view showing the auxiliary pole excitation type perpendicular magnetic head of this embodiment, and FIG. 8 is a sectional view taken along the line AA' in FIG.

The perpendicular magnetic head of this embodiment is composed of a main magnetic pole composite 821 and an auxiliary magnetic pole composite 822 disposed opposite to the main magnetic pole composite 821 with the recording medium in between. ) and (e) to (su), respectively.

(a) Main magnetic pole 81° made of a high magnetic permeability soft magnetic thin film such as Co-Zr or Co-Zr-Nb (b) Self-lubricating material base 811 sandwiching the main magnetic pole 81
a, 811b0 (c) High magnetic permeability magnetic blocks 810a, 810b0 for effectively preventing external magnetic fields (d) High permeability Va housing block 810a.

Slider thin plates 812a and 812b0 (e) made of a self-lubricating material that are bonded to the recording medium side surface of 810b and contribute to smooth and stable running between the head and the recording medium, and to extend the life of the recording medium. Auxiliary magnetic pole 83° made of a high magnetic permeability magnetic material (f) A recording/reproducing coil 82° wrapped around the auxiliary magnetic pole 83 (g) Concave slider thin body made of a self-lubricating material and contributing to a longer life of the recording medium 813° (H) High permeability magnetic material block C17 810a to effectively prevent external magnetic fields
', 810b'.

(su) These high magnetic permeability magnetic blocks 810a'810
Slider thin plates 812a' and 812b made of a self-lubricating material that are bonded to the recording medium side surface of b' and contribute to smooth and stable running between the head and the recording medium, and greatly contribute to extending the life of the recording medium. '.

In this way, in the perpendicular magnetic head of this embodiment, the base 8 is located at its tip, that is, at the contact portion with the recording medium.
11a, 811b and slider thin plates 812a, 812
b, 812a', 8121)' and the concave slider thin body 813 are made of self-lubricating material, enabling smooth and stable running between the head and the recording medium, thereby extending the life of the recording medium. be able to.

Next, an example of the procedure for manufacturing an auxiliary pole excitation type perpendicular magnetic head in this third embodiment is shown in FIGS. 9 and 10.
The explanation will be given sequentially using the exploded assembly diagrams shown in the figures.

■First, one surface of the base 811a made of glassy carbon self-lubricating material is mirror-polished, and the main magnetic pole 81a is placed on this laboratory surface.
A high magnetic permeability soft magnetic material such as Co--Zr or Co--Zr--Nb is sputtered into a thin film.

(2) After forming the thin film of the main magnetic pole 81 as required (the width of this thin film becomes the so-called track width during recording and reproduction), a base 811b made of the same material and the same shape as the base 811a is attached to sandwich the thin film. It is adhered and fixed to this base 811a.

A composite body of high permeability magnetic blocks 810a, 810b made of 9Mn-Zn ferrite etc. and slider thin plates 812a, 812b made of self-lubricating material is prepared by the above-mentioned procedure (2).
After bonding to both sides of the main pole sandwiching part composite formed in steps 2 and 3, the head tip surface, which is the contact surface with the recording medium, is shaped and polished to complete the main pole composite 821.

(2) A concave portion of the concave slider thin body 813 made of a self-lubricating material is ground, and a high permeability magnetic block 83 made of Mn--Zn ferrite or the like is bonded to this concave portion. At this time, the joint surface of the high permeability magnetic block 83 with the concave slider thin body 813 is mirror-polished in advance.

(2) A coil 82 for recording and reproducing is wound around the tip of the high permeability magnetic block 83 (near the joint of the concave slider thin body 813).

A T-shaped composite is formed of a composite of high magnetic permeability magnetic blocks 810a', 810b' made of 0M n Z n ferrite or the like and slider thin films 812a', 812b' made of a self-lubricating material in the steps (1) and (2) above. It is joined to both sides of the concave slider thin body 813. Thereafter, the head tip surface is shaped and polished so that the recording medium can run smoothly, and the auxiliary magnetic pole composite 822 is completed.

By performing the above steps, Figures 7 and 8 can be
The auxiliary magnetic pole excitation type perpendicular magnetic head of this embodiment shown in the figure is completed.

(Fourth Embodiment) Next, as a fourth embodiment of the present invention, an auxiliary pole excitation type perpendicular magnetic head that can perform recording and reproduction on both sides of a recording medium will be described.

FIG. 11 is a cross-sectional view of the auxiliary pole excitation type perpendicular magnetic head of this embodiment, which corresponds to the cross section taken along line BB' shown in FIG.

This auxiliary magnetic pole excitation type perpendicular magnetic head is constituted by perpendicular magnetic heads 91 and 92 placed opposite to each other with the recording medium RM in between. Each perpendicular magnetic head 91, 92 has a structure in which a main magnetic pole and an auxiliary magnetic pole are integrated, each of which includes a main magnetic pole 31 made of a high magnetic permeability soft magnetic thin film such as Co-Zr or Co-Zr-Nb, and An auxiliary magnetic pole 83 made of a high permeability magnetic material, a recording/reproducing coil 82 wound around the auxiliary magnetic pole 83, a concave slider thin body 813 made of a self-lubricating material, and a thin slider plate 812 made of a self-lubricating material. have. And facing 2
A pair of main magnetic poles and auxiliary magnetic poles respectively record and reproduce signals on each side of the recording medium.

Even in the auxiliary pole excitation type perpendicular magnetic head having such a double-sided head structure, the slider thin plate 812 and the concave slider thin body 8, which are the contact portion with the recording medium, are
13 is made of a self-lubricating material. Therefore, smooth running between the head and the recording medium is possible, and therefore, a longer life of the recording medium can be realized.

In addition, the above-mentioned auxiliary pole excitation type perpendicular magnetic head and the auxiliary pole excitation type perpendicular magnetic head capable of recording and reproducing on both sides of the recording medium are provided, and the slider thin plate 812.
The thickness of a, 812a', 812b, 812b' is 100
When the thickness is less than .mu.m, the magnetic shielding effect can be particularly high, and therefore excellent recording and reproducing characteristics can be obtained.

"Effects of the Invention" According to the perpendicular magnetic head of the present invention, all the contact parts with the recording medium are made of self-lubricating material except for the main magnetic pole, so that smooth and stable running between the head and the recording medium can be achieved. Therefore, even if the recording medium is continuously run for a long period of time, the recording medium will not be damaged, and the life of the recording medium can be extended.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main pole excitation type perpendicular magnetic head according to the first embodiment of the present invention, FIG. 2 is a sectional view of the main pole excitation type perpendicular magnetic head according to the first embodiment, and FIG. 4 and 4 are exploded views of the main pole excitation type perpendicular magnetic head in this embodiment, and FIG. 5 is an exploded view of the main pole excitation type perpendicular magnetic head in the second embodiment of the present invention. 6 is a sectional view of a main pole excitation type perpendicular magnetic head in the second embodiment, FIG. 7 is a perspective view of an auxiliary pole excitation type perpendicular magnetic head in the third embodiment of the present invention, and FIG. 8 is a sectional view of the auxiliary pole excitation type perpendicular magnetic head in this third embodiment, and FIGS.
FIG. 11 is an exploded view of an auxiliary pole excitation type perpendicular magnetic head according to the fourth embodiment of the present invention. FIG. Plan view of magnetic pole excitation type perpendicular magnetic head, No. 12
Figure B is a cross-sectional view of a conventional main pole excitation type perpendicular magnetic head.
FIG. 13 is a sectional view of a conventional auxiliary pole excitation type perpendicular magnetic head. 1.10.31.81... Main magnetic pole, 2, lla
,llb. 811.811 a, 81 l b-...-substrate, 3
...Core, 12.13a, 13b, 16a, 16b. 30 a, 30 b, 30 a', 30b', 3
3.83.810.810a, 810b, 810a',
810b'... High permeability magnetic block, 4.
20.34.82... Recording/reproducing coil, 6.
6', 6', 15a, 15b...Slider, 14a, 14b, 17a, 17b...
- Self-lubricating material thin plate, 33...Auxiliary magnetic pole, 61.62...Main pole excitation type perpendicular magnetic head, 91.92...Vertical magnetic head, 812. 8
12a, 812b, 812a', 812b'...
-Slider thin plate, 813...Concave slider thin body, 821...Main magnetic pole complex, 822...Auxiliary magnetic pole complex, RM...Recording medium. Applicant: Fuji Xerox Co., Ltd. Agent

Claims (1)

[Claims] 1. A perpendicular magnetic head that has a contact portion with a perpendicular magnetic recording medium and performs magnetic recording and reproduction with respect to the recording medium,
A perpendicular magnetic head, wherein the contact portion is made of a self-lubricating material. 2. The perpendicular magnetic head according to claim 1, wherein the contact portion with the recording medium made of the self-lubricating material is a thin plate. 3. The perpendicular magnetic head according to claim 1 or 2, wherein the perpendicular magnetic head is of a main pole excitation type. 4. The perpendicular magnetic head according to claim 1 or 2, wherein the perpendicular magnetic head is of an auxiliary magnetic pole excitation type. 5. The perpendicular magnetic head according to claim 2, wherein the thin plate has a thickness of 100 μm or less. 6. The perpendicular magnetic head according to claim 4, wherein the main magnetic pole and the auxiliary magnetic pole are integrated.