JPS61242308A - Production of vertical magnetic recording magnetic head - Google Patents

Abstract

PURPOSE:To obtain a vertical magnetic recording head having high permeability up to a high frequency area by securing such a structure where the easy axis for magnetization of a recording main magnetic pole film supported by a thin film supporting member made of a nonmagnetic material is set approximately parallel to the intra-face direction of a magnetic film of a magnetic recording medium and also to the track width direction. CONSTITUTION:A magnetic head consists of a main magnetic pole block 21 and an auxiliary magnetic pole block 22 and is driven in the direction 24 with a magnetic recording medium 23 held between both blocks 21 and 22. The block 21 contains a thin film supporting member 25 which rubs the medium 23 and a core aggregate 26 which is unified with the ember 25. The member 25 contains a monolithic structure of a thin film support member 28 for recording/reproduction which supports a magnetic thin film 27 for recording/ reproduction on one end faces, a thin film supporting member 30 for erasion which supports two magnetic thin films 29 for erasion on an end face with a prescribed apace and an intermediate substance 31 provided between both supporting members 28 and 30 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (FIELD OF THE INVENTION) The present invention relates to a magnetic head for perpendicular magnetic recording, and more particularly to a main pole excitation type magnetic head for perpendicular magnetic recording.

[Prior art]

In recent years, research and development of magnetic heads for perpendicular magnetic recording for high-density recording have been actively conducted, and these types of magnetic heads include main pole excitation type and auxiliary pole excitation type.

In the former main pole excitation type perpendicular magnetic recording magnetic head, it is known that the recording efficiency and reproduction efficiency increase in proportion to the magnetic permeability of the main pole (for example, Proceedings of the 18th Tohoku University Research Institute Symposium 1982). March P35-P45
), By the way, the frequency characteristics of the magnetic permeability of the main pole differ greatly between the easy magnetization axis direction and the hard magnetization axis perpendicular to the easy magnetization axis direction.

The figure shows Go-Zr-Nb with a film thickness of 0.6 μm.
In Figure 0, which is a characteristic diagram showing the relationship between the initial magnetic permeability and frequency of a magnetic thin film made of an amorphous alloy, MH and A are characteristic lines in the direction of the hard magnetization axis, ME and A.

is the characteristic line in the direction of the easy axis of magnetization.

As is clear from this figure, in the high frequency region of 100 KHz or higher, the magnetic permeability is greater in the direction of the axis of hard magnetization (lines H, A,) than in the direction of the axis of easy magnetization (lines E, A,). Therefore, the direction of the axis of easy magnetization, which has good high frequency characteristics, is directed toward the operating direction of the main magnetic pole (the direction perpendicular to the recording surface of the magnetic recording medium). It can be seen that the high frequency characteristics of the magnetic head are improved by arranging the main pole so as to be substantially parallel to the track width direction of the recording medium.

On the other hand, FIG. 1 is a perspective view of a typical main pole used in a conventional magnetic head for perpendicular magnetic recording. This main magnetic pole 1 has a hard non-magnetic substrate 2 made of, for example, ceramics or non-magnetic ferrite, which is placed on the side that comes into sliding contact with the magnetic recording medium.
and a magnetic substrate 3 made of, for example, magnetic ferrite, which is bonded thereto.

On one side of these substrates 2.3, for example, Co-Z
The structure is such that a magnetic thin film 4 of r-Nb amorphous alloy or the like is formed by sputtering or vapor deposition, and a coil 5 is placed around the outer periphery of this magnetic thin film 4 and the magnetic substrate 3.

As mentioned above, if the axis of easy magnetization of the magnetic thin film @4 is to be aligned in the track width direction, it is necessary to form the magnetic thin film 4 in a magnetic field, or to perform heat treatment in a magnetic field after forming the magnetic thin film 4. .

By the way, since the conventional main magnetic pole 1 has a structure in which the magnetic thin film 4 is formed directly on the magnetic substrate 3, the above-mentioned magnetic field is concentrated toward the magnetic substrate 3, and therefore the magnetic field to the magnetic thin film 4 is weak. or the direction of the magnetic field may be distorted. As a result, it is difficult to form an axis of easy magnetization in the magnetic thin film 4,
Furthermore, even if it were possible, the directions would not be aligned neatly and the dispersion of directions would be large, making it impossible to fully exhibit the high frequency characteristics in the direction of the hard magnetization axis.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a magnetic head for perpendicular magnetic recording that has high magnetic permeability up to a high frequency range.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a structure in which the axis of easy magnetization of the recording main pole film supported by a thin film support member made of a non-magnetic material is approximately parallel to the in-plane direction of the magnetic film in the magnetic recording medium. In addition, it is configured to be substantially parallel to the track width direction. On the other hand, a recording core portion around which a coil is wound is fabricated separately from the thin film support member with the main recording magnetic pole film, and then one end of the main recording magnetic pole film and one end of the recording core portion are fabricated. It is characterized by assembling the main magnetic pole by joining them together.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. 1st
FIG. 2 is an exploded perspective view of a magnetic head according to one embodiment, and FIG. 2 is a longitudinal sectional view showing the state in which the magnetic head is used.

The magnetic head consists of a main pole block 21 and an auxiliary pole block 2.
2, and is run in the direction 24 with a magnetic recording medium 23 sandwiched between them as shown in FIG.

The main pole block 21 is composed of a thin film support member 25 that is in sliding contact with the magnetic recording medium 23, and a core assembly 26 that is integrally joined to the thin film support member 25.

First, the structure of the thin film support member 25 and its manufacturing method will be explained. As shown in FIG. 1, the thin film supporting member 25 includes a thin film supporting member 2B for recording and reproducing which supports one magnetic thin film 27 for recording and reproducing on its end face, and two magnetic thin films 29 for erasing at a predetermined interval on the end face. The erasing thin film supporting member 30 supporting the supporting members 28 and 30 and an intermediate body 31 interposed between the supporting members 28 and 30 are integrally joined.

Since the support members 28, 30 and the intermediate body 31 are non-magnetic and have a sliding surface with the magnetic recording medium, they are required to have mechanical properties such as wear resistance. Examples include carbon composites, ceramics, glass, and non-magnetic ferrite.

Among these, carbon composite materials are preferred, and are mainly composed of a carbon porous body, a metal that fills the voids of the carbon porous body, and a synthetic resin that closes the voids of the filled metal. .

Next, this composite material will be explained in detail. First, the carbon materials used include natural graphite, artificial graphite, coal coke, petroleum coke, carbon black, coal powder, etc., and are either carbonaceous or graphite, or carbonaceous and graphite. It may be a mixture of.

Although these carbon materials have excellent self-lubricating properties, they do not have sufficient mechanical strength, which is why mechanical strength-enhancing materials are used. These mechanical strength-enhancing materials include binders and impregnating materials. , each may be used alone, or a binding material and an impregnating material may be used together.

As the binder, a resin binder, a pitch coke binder, or the like is used. As the resin binder, various thermosetting resins such as phenol resin, divinylbenzene resin, furan resin, and epoxy resin, or various thermoplastic resins such as fluororesin and polyacetylene resin are used. After binding, this resin binder can be heat-treated in an inert atmosphere to partially carbonize and graphitize it.

The pitch coke binder is made by using coal pitch or petroleum pitch as a binder and sintering it after binding to form pitch coke.

The sintered material of the carbon material and the mechanical strength enhancing material has fine voids formed on its surface and inside, resulting in a decrease in mechanical strength. To this end, the voids in the carbon porous body are filled with a metal impregnating material to improve mechanical strength.

As the metal impregnating material, tin, antimony, copper, zinc, silver, lead, aluminum, magnesium, cadmium, etc. alone or an alloy thereof can be used. The metal impregnating material is impregnated at a temperature of about 50-100° C. above its melting point.

When the metal impregnated material is cooled, fine pores may be formed on the surface or inside the metal impregnated material.

When such fine pores are formed, the mechanical strength also decreases, so the pores are filled with a synthetic resin to close the pores, thereby increasing the mechanical strength.

As the synthetic resin, phenol resin, divinylbenzene resin, epoxy resin, furan resin, fluororesin, polyethylene resin, polypropylene resin, polyamide resin, etc. are used.

The content of the carbon material in this composite material of the carbon material and the mechanical strength enhancing material is about 50 to 95% by volume, and if the content of the carbon material is lower than that, sufficient lubricity cannot be obtained;
If the carbon material content exceeds about 95% by volume, the mechanical strength will be too low.

As mentioned above, the magnetic thin film 27 is formed on the end face of the support member 28.30.
．． However, the magnetic thin films 27 and 29 cannot be directly formed on the end faces of the supporting members 28 and 29. In other words, the surfaces of the supporting members 28 and 30 made of carbon composite material, ceramics, non-magnetic ferrite, etc. Even after polishing, there are micropores and fine irregularities on the surface, making it unsuitable for directly forming a magnetic thin film 27. As shown in FIG.
2 was formed respectively to ensure the flatness of the surface.

As this organic polymer film 32, a magnetic thin film 27 is formed in a later process.
．． Since the material 29 is exposed to high temperatures when forming the material 29, a polyimide resin having particularly excellent heat resistance is suitable, but other silicone resins and polyamide resins are also applicable. Organic polymers! A method for forming I32 is the so-called spinner method in which the support member 28.30 is rotated at high speed and the centrifugal force at that time is used to spread a polymer resin solution on the surface of the support member 28.30 to form a film. suitable.

In this way, the organic polymer H3 is attached to the end face of the support member 28.30.
2, it is possible to obtain a surface with extremely low surface roughness, but it is not without problems. In other words, the coefficient of thermal expansion of the organic polymer film 32 is This is extremely large. That is, the thermal expansion coefficient of the magnetic thin film 27°29 is about 100 to 1 l.
For example, in the case of the organic polymer film 32 made of polyimide resin, the thermal expansion coefficient is approximately 400 to 800xlO-7cm/am/
``c'', and there is a considerable difference between the two. Therefore, if the magnetic thin film 27.29 is formed directly on the organic polymer film 32, the temperature around the magnetic head will become low or high. In this case, the organic polymer film 32 and the magnetic thin film 27°2
The difference in thermal expansion coefficient between the magnetic thin films 27 and 29 causes internal stress in the magnetic thin films 27 and 29, which deteriorates their magnetic properties.

Therefore, in the magnetic head of the present invention, an intermediate film 3 having a thermal expansion coefficient close to that of the magnetic thin film 27.29 is formed on the surface of the organic polymer film 32.
3 was formed, and a magnetic thin film 27°29 was provided thereon. This intermediate film 33 must be made of a non-magnetic material, such as alumina, silicon dioxide, or a non-magnetic metal, and the method for forming the intermediate film 33 takes advantage of the flatness obtained by the organic polymer film 32. Therefore, sputtering and vapor deposition are suitable. Intermediate film 33 made of alumina mentioned above
The coefficient of thermal expansion of is about 80X10-'c/C/℃, and that of silicon dioxide is about 4X1G-'c/C/℃
The coefficient of thermal expansion is close to that of the magnetic thin film 27.29.

As the magnetic thin film 27, 29 formed on the surface of the intermediate film 33, Co-based amorphous such as Co-Zr-Nb or Co-Hf-Ta, permalloy, or sendust is used, and the thin film can be formed by sputtering or vapor deposition. It is provided to a predetermined thickness using technology.

When forming the recording/reproducing magnetic thin film 27, a magnetic field of, for example, about 100 Gauss is applied at the same time, and the magnetic thin film 27 whose easy magnetization axes (E, A,) are aligned in a desired direction is formed.

4 and 5 are explanatory diagrams for mass-producing the thin film supporting member 28 having the magnetic thin film 27, and in both figures, the above-mentioned organic polymer film 32 and intermediate film are used to simplify the drawings. The illustration of 33 is omitted.

An organic polymer film and an intermediate film are sequentially formed on the entire upper surface of a supporting member element body 28a having a size that allows a large number of thin film supporting members 28 to be formed, and then a magnetic thin film 27 element is formed thereon using a thin film forming technique. A film 27a is formed. As described above, since a magnetic field is applied when forming this elementary film 27a, the direction of the easy axis of magnetization (E,
A,) are complete.

Next, as shown in FIG. 5, the element film 27a is etched in a stripe shape to form a narrow band part 27b, and then this narrow band part 27b and the supporting member element body 28a are combined together with a single chain A.
Cut sequentially along the IC.

By doing so, there are a large number of thin film supporting members 28 of a predetermined size, each having a magnetic thin film 27 whose easy magnetization axis is perpendicular to the longitudinal direction of the striped magnetic thin film 27 in the direction of the hard axis of magnetization. You can take it.

The intermediate film 33 is placed on the surface on which the magnetic thin films 27 and 29 are formed.
Similarly, a nonmagnetic and hard first protective film 34 made of alumina, silicon dioxide, or nonmagnetic metal, and a second protective film 35 made of an organic polymer such as polyimide resin, silicone resin, or polyamide resin. are sequentially formed in a laminated state. If the magnetic thin film 27.29 is sandwiched between a relatively hard intermediate film 33 and the first protective film 34, the intermediate film 33 and the first protective film 34 can serve as reinforcement for the magnetic thin film 27.29. This is useful and can prevent the edges of the magnetic thin films 27 and 29 from sagging due to sliding contact with the magnetic recording medium.

After that, the second protective film 35 of the thin film supporting member 28 for recording and reproduction and the second protective film 3 of the thin film supporting member 30 for erasing are applied.
5, and the recording/reproducing thin film supporting member 28 and the erasing thin film supporting member 30 are bonded together with the intermediate body 31 in between to bond them together, thereby forming a thin film supporting member. 25 are configured.

Next, the structure of the core assembly 26 and its manufacturing method will be explained. As shown in FIGS. 1 and 6, the core assembly 26 includes a recording/reproducing core 38 around which a recording/reproducing coil 37 is wound, and an erasing core 40 around which an erasing coil 39 is wound.
and a separator 41 made of a non-magnetic material interposed between the recording/reproducing core 3 and the erasing core 40.

7 and 8 are perspective views showing an example of a method for manufacturing the core assembly 26. FIG. In this example, the recording/reproducing core 38
The erasing core 40 is produced from one block-shaped core body 42 made of ferrite or the like. That is, the seventh
As shown in the figure, a concave groove 46 is formed between the recording/reproducing core forming part 43 and the erasing core forming part 44 of the core body 42, that is, in the separator forming part 45, from one end surface to the other end surface. It is formed to have a predetermined depth so as to penetrate through it. Even if the groove 46 is formed, the recording/reproducing core forming part 43 and the erasing core forming part 44 are integrally connected through the groove bottom 47. A non-magnetic material with binding properties such as low melting point glass, synthetic resin or non-magnetic metal is poured into the
The separator 41 is formed by cooling and solidifying.

Then, as shown in FIG. 8, a first groove 48 and a second groove 49 are formed in the core body 42 from the groove bottom 47 side toward the separator 41 side, which are substantially parallel to the longitudinal direction of the separator 41.
and a third groove 50 and a fourth groove 5 perpendicular to these grooves.
1 and the fifth groove 52 are formed by cutting. As shown in the figure, the first groove 48 is formed on the recording/reproducing core forming part 43, the second groove 49 is formed on the separator 41, and the third groove 50 is formed on the erasing core forming part 44, from one end surface. It is formed so as to penetrate toward the other end surface.

Further, the fourth groove 51 and the fifth groove 52 are formed so as to penetrate from one end surface to the other end surface from the recording/reproducing core forming portion 43 to the separator 41 and the erasing core forming portion 40.

The groove depth jl (see FIG. 8) of the first groove 48 and the second groove 49 is approximately equal to the height of the recording/reproducing coil 37 as shown in FIG. The groove depth 43 (see FIG. 8) of the five grooves 52 is the recording/reproducing coil 37.
It is designed to be approximately equal to the sum of the height of the erasing coil 39 and the height of the erasing coil 39.

Furthermore, the thickness 12 of the groove bottom portion 47 shown in FIG.
It is designed to be slightly smaller than the groove depth 11 of the groove 49,
By forming the second groove 49, the separator 41
is certain to be reached. With such dimensional design, the recording/reproducing core 38 and the erasing core 40 can be magnetically separated reliably by forming the second groove 49.

Note that the recording/reproducing core 38 and the erasing core 40 are separate.
- Since they are connected via the separator 41, even if the second groove 49 is formed on the separator 41, they will not be separated.

The three first grooves 48, the second grooves 49, the third grooves 50, and the two
By forming the fourth groove 51 and the fifth groove 52 of the book so as to cross each other, the following sections can be made at the same time.

That is, a recording/reproducing central leg 53 and an erasing central leg 54 are erected approximately at the center of the core assembly 26 with an interval corresponding to the thickness of the separator 41 . Coil storage recesses into which coils 37 and 39 are inserted are formed around the recording/reproducing central leg 53 and the erasing central leg 54. Further, side end leg parts 55 for recording and reproducing are formed on both sides of the central leg part 53 for recording and reproducing, and side end leg parts 56 for erasing are formed on both sides of the central leg part 54 for erasing. Furthermore, support legs 57 having a relatively large area are provided at each of the four corners of the core assembly 26.

The recording/reproducing coil 37 and the erasing coil 39 are formed into a cylindrical shape using self-bonding wire. As shown in FIG. 2, the erasing coil 39 is first fitted onto the erasing central leg 54, and then the recording/reproducing coil 37 is fitted onto the recording/reproducing central leg 53. Therefore, the recording/reproducing coil 37 and the erasing coil 39 partially overlap on the separator 41, and this results in the distance between the recording/reproducing central leg 53 and the erasing central leg 54, in other words, the recording/reproducing magnetic thin film 27 The distance between the erasing coil 1l129 and the erasing coil 1l129 can be made as small as possible. Recording/reproducing coil 3
7 and the end of the erasing coil 39 are connected to the core assembly 26
The recording/reproducing coil 37, the erasing coil 39, or these are pulled out from any one of the first groove 48 to the fifth groove 52 to the outer periphery of the core assembly 26 through the groove, and if necessary, an adhesive is poured into the groove. Fix the ends of the coil to prevent wire breakage.

In this way, the core assembly 26 is constructed, on which the thin film supporting member 25 described above is placed, and as shown in FIG. The sliding contact end and the opposite end come into contact with the upper surfaces of the recording/reproducing central leg 53 and the erasing central leg 54, and are magnetically connected to each other. Therefore, the width of the erasing central leg 54 (recording/reproducing central leg 53) is designed to be such that the two erasing magnetic thin films 29 can come into complete contact with each other.

After placing and positioning the I membrane support member 25 on the core assembly 26, as shown in FIG.
and the core assembly 26 are joined together. Note that this adhesive M58 is attached to the first groove 48 to the fifth groove 5 in the core assembly 26.
It is also possible to pour it into the appropriate groove of No. 2 and try to adhere it to the thin film support member 25.

The aforementioned auxiliary magnetic pole block 22 (see FIGS. 1 and 2) is used to improve recording/reproducing and erasing efficiency.

The auxiliary magnetic pole block 22 is composed of a core block 59 made of ferrite, sendust, or the like and having approximately the same size as the core assembly 26, and a wear-resistant layer 60 provided on the side of the core block 59 that is in sliding contact with the magnetic recording medium 23. has been done. Like the thin film support member 25, this wear-resistant layer 60 is made of a carbon composite, ceramics, glass, or non-magnetic ferrite, and in particular, a carbon composite can be used.

A disk-shaped or tape-shaped magnetic recording medium 23 running while being sandwiched between the auxiliary magnetic pole block 22 and the main magnetic pole block 21 has a base film 61 and a soft magnetic layer 62 as shown in FIG. , and a recording layer 63 having perpendicular magnetic anisotropy are formed in a laminated state.

As shown in FIG. 2, the auxiliary magnetic pole block 22 includes a recording/reproducing magnetic thin film 27 of the main magnetic pole block 21 and an erasing magnetic thin film 27.
ll1l129, the recording/reproducing side end leg 55, the erasing side end leg 56, etc., forming a closed magnetic path during recording/reproducing or erasing.

FIG. 9 shows a magnetic recording medium 23 having recording layers 63 on both sides.
FIG. 2 is a longitudinal cross-sectional view showing an example of a magnetic head suitable for use in the present invention.

In this example, the auxiliary magnetic pole block 22 is unnecessary, and instead, the core portion of the other magnetic head that faces the magnetic recording medium 23 functions as the auxiliary magnetic pole (image core), as shown in the figure. , magnetic thin film for recording and reproduction 2
7 (erasing magnetic thin film 29), recording/reproducing central leg portion 53
(erasing center leg 54) and recording/reproducing coil 3
7 (erasing coil 39) and the like are shifted to opposite positions at a predetermined interval along the track arrangement direction in the magnetic recording medium 23 (direction perpendicular to the running direction of the magnetic recording medium 23). Therefore, the magnetic thin film 27 for recording and reproduction
(The erasing magnetic thin film 29) faces the recording/reproducing side end leg 55 (erasing side leg 56) of the counterpart magnetic head, and the recording/reproducing side end leg 55 (erasing side end leg 56) serves as an image core.

Incidentally, since the manufacturing method of the magnetic head is the same as described above, the explanation thereof will be omitted.

In the above embodiment, a magnetic field was applied when forming the recording magnetic thin film so that the easy axis of magnetization and the axis of hard magnetization were oriented in predetermined directions, but the present invention is not limited to this. After forming a magnetic thin film for recording, it can be heat-treated in a magnetic field to direct the easy axis of magnetization and the axis of hard magnetization to predetermined directions.

〔Effect of the invention〕

The present invention has the above-described structure, and since the thin film supporting member supporting the recording main pole film and the core portion made of a magnetic material are made separately, the axis of easy magnetization of the recording main pole film There is no magnetic influence due to the presence of a magnetic material during the process of aligning the directions, and the directions of the easy magnetization axes can be neatly aligned. In addition, directing the easy axis of magnetization of the main pole film in the in-plane direction of the magnetic film in the magnetic recording medium means that
In other words, the direction of the hard magnetization axis of the main pole film is directed toward the operating direction of the magnetic head, and by doing so, the high frequency characteristics can be improved as is clear from the characteristic diagram in FIG. 1θ.

[Brief explanation of the drawing]

1 to 9 are for explaining a magnetic head according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of the magnetic head, and FIG. 2 is a vertical cross-section showing the use and state of the magnetic head. 3 is an enlarged cross-sectional view of a thin film support member in this magnetic head, FIGS. 4 and 5 are explanatory diagrams for manufacturing a thin film support member having a magnetic thin film for recording and reproduction, and FIG. 6 is an enlarged cross-sectional view of a thin film support member in this magnetic head. A plan view of the core assembly in this magnetic head, FIGS. 7 and 8 are perspective views showing an example of a method for manufacturing the core assembly, and FIG. 9 is a longitudinal sectional view of a magnetic head according to another embodiment of the present invention. , FIG. 10 is a characteristic diagram showing the relationship between magnetic permeability and frequency in the direction of the hard axis of magnetization and the direction of the easy axis of magnetization, and FIG. 11 is a perspective view of the main pole used in a conventional magnetic head. 21... Main magnetic pole block, 23... Magnetic recording medium, 25... Thin film support member, 26... Core assembly, 27... Magnetic thin film for recording and reproduction, 28... . . . thin film support member for recording and reproduction, 53 . . . central leg for recording and reproduction. Figure 4 Figure 6 26

Claims (1)

[Claims] The easy magnetization axis direction of the recording main pole film supported by a thin film support member made of a non-magnetic material is configured to be substantially parallel to the in-plane direction of the magnetic film in the magnetic recording medium and also substantially parallel to the track width direction. A recording core portion around which a coil is wound is manufactured separately from the thin film support member with the main recording magnetic pole film, and one end of the main recording magnetic pole film and one end of the recording core portion are integrated. A method for manufacturing a magnetic head for perpendicular magnetic recording characterized by bonding.