JPS63222313A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a head which has a satisfactory wear resistance and is superior in durability, by forming a carbon film on a slide face to a magnetic recording medium. CONSTITUTION:A core 2 of a magnetic head 1 is made of ferrite materials, and a high permeability layer 4 consisting of permalloy, sendust, or the like whose saturation magnetization is higher than that of ferrite materials and wear resistance is lower than that of ferrite materials is provided on both end faces of a gap 3. A carbon film 5 consisting of a graphite is formed on a slide face 10 to a recording medium 6 with 50-2,000Angstrom film thickness by sputtering or the like. Thus, the wear resistance of the slide face 10 is improved, and the recording and reproducing characteristic is not degraded by repeated running, and the magnetic head superior in durability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Background of the Invention Technical Field The present invention relates to a magnetic head for magnetic recording media such as magnetic cards, floppy disks, magnetic tapes, and hard disks.

Prior art and its problems Magnetic heads for magnetic recording media typically have
Sliding with the medium during the first year of life. At this time, wear occurs on the sliding surface of the core of the magnetic head with the medium due to friction.

Therefore, the core material of the magnetic head is required to have high wear resistance.

Conventionally, ferritic materials have been widely used as core materials because of their superior wear resistance compared to other materials.

In recent years, metal-based high permeability materials such as permalloy, sendust, Co-based amorphous materials, and Fe-based soft magnetic materials, whose saturation magnetization is larger than that of ferrite-based materials, have been used as core materials for magnetic heads compatible with high-coercivity magnetic recording media. It is used in combination with ferrite core material or in combination with ferrite core material.

However, metal-based high magnetic permeability materials generally have lower wear resistance than ferrite-based materials, and especially composite types in which a metal-based high permeability material with low wear resistance is formed on the end face of the gap part of a ferrite-based core. In a magnetic head, since the degree of wear of the ferrite-based material and the metal-based high permeability material differs, the sliding surface of the magnetic head becomes uneven due to sliding with the medium, resulting in deterioration of recording/reproducing characteristics.

In order to prevent such wear, it has been proposed to form a protective film of oxide, nitride, carbide, etc. on the sliding surface of the magnetic head with the magnetic recording medium (Japanese Patent Laid-Open No. 58-175).
Publication No. 22, etc.).

However, since these protective films are binary compounds, film formation is complicated, and they are not necessarily satisfactory in terms of productivity, cost, etc.

In addition, protective films made of oxides, nitrides, carbides, etc.
It is difficult to obtain thin films with excellent wear resistance by sputtering targets such as nitrides and carbides.
During film formation, it is necessary to introduce a reactive gas such as oxygen, nitrogen, or hydrocarbon, heat the material to be film-formed, or apply a voltage. However, when the material to be film-formed is the sliding surface of a magnetic head, it is practically difficult to heat it or apply a voltage to it. Moreover, it is particularly difficult to do so when the head is molded with resin or the like, such as a magnetic card head, an audio head, a video head, or the like.

Furthermore, even if these protective films can be formed, their hardness is too high and there is a risk of damaging the magnetic recording medium.

II. OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic head that is easy to manufacture, has excellent abrasion resistance, has no deterioration in recording and reproducing characteristics even when the medium is turned back, and has excellent durability. It's about doing.

■Disclosure of invention Such objects are achieved by the invention described below.

That is, the first invention is a magnetic head characterized in that it has a core with a gap and a carbon film is formed on the surface that slides against a magnetic recording medium.

Further, the second invention has a core, a casing, and a molding material having a gap, the core is housed in the casing, and the molding material is filled between the casing and the core, and the magnetic recording medium is connected to the core. This magnetic head is characterized in that a carbon film is formed on the sliding surface.

■Specific structure of the invention Hereinafter, the configuration of the present invention will be specifically explained.

A preferred embodiment of the magnetic head of the present invention is shown in FIGS.
As shown in the figure.

The magnetic head 1 shown in FIG. 1 has a core 2 having a gap 3. The core 2 is made of a ferrite material or the like, and the saturation magnetization on both end surfaces of the gap 3 is larger than that of the ferrite material, making it resistant to wear. Permalloy, Sendust, CO-based amorphous materials with lower properties than ferritic materials) 4.
It has a thin plate or film-like high magnetic permeability layer 4 made of a metal-based high magnetic permeability material such as a Fe-based soft magnetic material.

A carbon film 5 is formed on the sliding surface 10 of the core 2 that contacts the magnetic recording medium in order to impart wear resistance to the sliding surface IO.

The magnetic head 1 shown in FIG. 2 has a core 2 having a gap 3 and made of the various metal-based high magnetic permeability materials mentioned above.

At least the sliding surface 1 of the core 2 with respect to the magnetic recording medium
Carbon WA5 is formed on the entire surface of 0.

Note that the present invention is also applicable to the case where the core 2 of the magnetic head 1 shown in FIG. 2 is formed of a ferrite material.

In addition to these, the present invention can also be applied to a magnetic head having a slider integrated with a core as described above, and in this case, the carbon film 5 is at least connected to the magnetic recording medium of the core and the slider. Formed on the entire sliding surface.

The slider material is usually a ferrite material, various non-magnetic ceramics, glass, or the like.

The gap 3 is formed by a nonmagnetic space or a gap material layer made of various nonmagnetic materials such as inorganic materials such as SiO□, metals such as Ti, and various types of glasses.

When the gap 3 is formed of a gap material layer, the carbon film 5 is formed on at least the entire surface of the core 2 that slides with the magnetic recording medium 6 and the gap material layer that slides with the magnetic recording medium 6. Ru.

FIG. 3 shows another embodiment of the magnetic head of the present invention.

In the magnetic head 1 shown in FIG. 3, a core 2 having a gap 3 and made of a ferrite material is housed in a casing 11, and a molding material 12 is filled between the casing 11 and the core 2. .

The casing 11 is generally made of a magnetic metal such as permalloy, various non-magnetic metals, resin, etc., and the molding material 12 is made of various resins such as epoxy resin.

The gap 3 is formed of a non-magnetic space or a gap material layer as described above, and has high magnetic permeability layers 4 formed of the above metal-based high magnetic permeability material on both end faces of the gap 3.

A carbon film 5 is formed on at least the entire surfaces of the core 2, casing 11, and mold material 12 that slide against the magnetic recording medium 6.

Further, when a gap material layer is provided, the carbon film 5 is formed not only above but also on the entire surface of the sliding surface of the gap material layer with respect to the magnetic recording medium 6.

Note that the present invention can also be applied when the high magnetic permeability layer 4 is not provided in the gap 3 and the core 2 is formed of the above-mentioned metal-based high magnetic permeability material. Further, the present invention can also be applied to a case where the high magnetic permeability layer 4 is not provided and the core 2 is formed of a ferrite material.

Furthermore, in addition to these, the present invention provides a magnetic head in which a slider integrated with a core as described above is housed in a casing, and a molding material is filled between the slider integrated with the core and the casing. In this case, the carbon film 5 is formed on at least the entire surfaces of the core, slider, molding material, and casing that slide against the magnetic recording medium.

In the example described above, the high magnetic permeability layer 4 is not limited to the above-mentioned material with high saturation magnetization and high magnetic permeability, but is also made of a material with low saturation magnetization and high permeability to achieve a wide gap during recording and a narrow gap during reproduction. A magnetic material may be used, a combination of these materials, or various other magnetic metals may be used.

The thickness of the carbon film 5 is preferably 50 to 2000, particularly preferably 500 to 1000.

If the film thickness is less than 50λ, sufficient wear resistance will not be obtained, and even if the number of participants exceeds 2000, the effect of the present invention will not improve, and on the contrary, spacing loss will become a problem.

The carbon film 5 can be formed using a general thin film forming method, such as a sputtering method, a vapor deposition method, a CVD method, an ion blating method, or the like.

In particular, the carbon film created by the above method, commonly called diamond-1ike carbon, has high hardness and wear resistance, and has a film thickness within the above range that reduces friction with the magnetic recording medium. It has sufficient wear resistance.

V. Effects of the Invention The magnetic head of the invention has a carbon film on the sliding surface with respect to the magnetic recording medium.

For this reason, the sliding surface with the magnetic recording medium has good wear resistance, and the recording/reproducing characteristics do not deteriorate even with repeated running of the magnetic recording medium, making it possible to create a magnetic head with excellent durability. Furthermore, due to the lubricity of the carbon film itself, it does not cause damage to the medium.It also has good adhesion to molding materials, etc., and does not damage the molding materials.

■Specific embodiments of the invention Hereinafter, the present invention will be explained in detail by giving specific examples.

[Example 1] A high magnetic permeability layer 4 made of permalloy is formed on both end faces of the gap 3 of the core 2 made of a ferrite material, and a glass having a hardness comparable to that of the ferrite material is used as the gap material layer. A carbon film 5 with a thickness of 500 mm was formed on the entire surface of the core 2, the high magnetic permeability layer 4, and the gap material layer on the sliding surface side with the magnetic recording medium, using a magnetic head as shown in FIG. 1. did.

The carbon rss was formed into a film by sputtering using a graphite target.

For comparison, a magnetic head similar to the above except that the carbon film 5 was not provided was fabricated.

The condition of the sliding surface after passing through 10 million buses was measured using a stylus type surface roughness meter.

The results are shown in Figure 4.

As is clear from FIG. 4, the sliding surface of the magnetic head formed with the carbon film of the present invention is flat, but in the magnetic head without the carbon film, the wear of the permalloy high permeability layer is significant and the sliding surface is flat. Unevenness occurred on the moving surface.

[Comparative Example 1] In Example 1, instead of the carbon film 5, a protective film formed of TiN was formed into a nail-shaped layer with a thickness of 200 mm. In this case, T
When forming the iN protective film, reactive sputtering was performed using Ti1 as the target and nitrogen as the reactive gas, but a good film could only be obtained at a substrate (magnetic head) temperature of about 300°C; The electromagnetic conversion characteristics of the head were extremely low compared to Example 1.

[Example 2] High magnetic permeability layers 4 made of permalloy are formed on both end faces of the gap 3 of the core 2 made of ferrite material, and a glass material having the same hardness as the ferrite material is used as the gap material. The core 2 was provided as a layer, and the core 2 was housed in a casing 11 made of permalloy, and a molding material 12 made of epoxy resin was filled between the core 2 and the casing 11 to produce a magnetic head.

On the sliding surface side of such a magnetic head with the magnetic recording medium,
50 by sputtering using graphite as a target
When a zero-thick nail-shaped film was formed, a magnetic head with good adhesion and no damage to the molding material was obtained.

Furthermore, the wear resistance was also equivalent to that of Example 1.

[Brief explanation of the drawing]

1, 2, and 3 are partial cross-sectional views showing embodiments of the magnetic head of the present invention. FIG. 4 is a diagram showing the state of the surface roughness of the sliding surface of the magnetic head with respect to the magnetic recording medium. Explanation of symbols 1...Magnetic head, 2...Core. 3... Gap, 4... High magnetic permeability layer, 5... Carbon film, 6... Magnetic recording medium, 11-... Casing, 12... Mold material applicant TDC Co., Ltd. Agent Patent Attorney Yo Ishii -1 FIG, 1 FIG, 2 FIG, 3 FIG, 4

Claims (12)

[Claims] (1) A magnetic head characterized in that it has a core with a gap and a carbon film is formed on the sliding surface with a magnetic recording medium. (2) The magnetic head according to claim 1, wherein the carbon film has a thickness of 50 Å to 2000 Å. (3) The magnetic head according to claim 1 or 2, which has a gap material between the gaps. (4) The magnetic head according to claim 1 or 2, which has a magnetic metal and a gap material between the gaps. (5) The magnetic head according to any one of claims 1 to 4, wherein the sliding surface of the magnetic head with the magnetic recording medium includes the sliding surface of the core with the magnetic recording medium. (6) Claims 1 to 5 have a slider integrated with the core, and the sliding surface of the magnetic head with the magnetic recording medium includes the sliding surface of the core, the slider, and the magnetic recording medium. The magnetic head according to any one of item 4. (7) It has a core, a casing, and a molding material with a gap, the core is housed in the casing, the molding material is filled between the casing and the core, and the sliding surface with the magnetic recording medium is made of carbon. A magnetic head characterized by having a film formed thereon. (8) The magnetic head according to claim 7, wherein the carbon film has a thickness of 50 Å to 2000 Å. (9) The magnetic head according to claim 7 or 8, which has a gap material between the gaps. (10) The magnetic head according to claim 7 or 8, which has a magnetic metal and a gap material between the gaps. (11) The magnetic head according to any one of claims 7 to 10, wherein the sliding surface of the magnetic head with the magnetic recording medium includes the sliding surface of the core and the molding material with the magnetic recording medium. head. (12) Claim 1, which has a slider integrated with the core, and the sliding surface of the magnetic head with the magnetic recording medium includes the sliding surface of the core, the slider, the molding material, and the magnetic recording medium. The magnetic head according to any one of Items 7 to 10.