JPS61211807A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head with excellent wear resistance without wearing a magnetic recording medium by forming a graphite coating film onto a face of a magnetic head making sliding contact with a magnetic recording medium. CONSTITUTION:The graphite coating film 10 is formed on to the face 9 of the magnetic head where the 1st core half 1 and the 2nd core half 2 are bonded incorporatedly via a magnetic gap 5 making sliding contact with the magnetic recording medium. The graphite coating film 10 is formed uniformly by the CVD or sputtering method at an atmosphere of 200 deg.C below the crystallizing temperature of magnetic coating films 6, 8 of the amorphous metal and no carbon having diamond structure is included.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head, and particularly to a protective film formed on the sliding surface of a tungsten (W) recording medium.

[Conventional technology]

FIG. 3 is a perspective view showing an example of a conventional magnetic spatula, in which a first core half 1, a second core half 2, and a second core half 1 are formed on the first core half 1. The excitation coil wound on the second JA/#3 is configured from an Ill (not shown) to a Code.

The first core half I of item 11i includes a first core base body 4 and a first magnetic thin film 11#6 made of a metallic magnetic material having a high saturation magnetic flux density and deposited on the side facing the magnetic gap 5 of the first core base body 4. It consists of Similarly, the second core half 2 also has the following characteristics:
It is composed of a second core base 7 and a second magnetic thin film 8 made of a metallic magnetic material having a high saturation magnetic flux density and deposited on the side of the second core base 7 facing the magnetic gap 5 .

As the material for the first core substrate 4 and the second core substrate, single-crystal manganese Ilf!button ferrite is used because it has a small amount of vacancies (L) and a dense crystal structure. On the other hand, the materials of the first magnetic thin film 6 and the second magnetic thin film 8 include one or more elements selected from the group of iron, nickel, and cobalt, which have high saturation magnetic flux density and high magnetic permeability. An alloy consisting of one or more elements selected from the group of phosphorus, carbon, boron, and silicon, or an alloy consisting of these as main components such as aluminum, germanium, helium, tin, indium, molybdenum, tungsten, titanium, manganese, chromium,
There are alloys to which elements such as zirconium, hafnium, and niobium are added, and alloys containing cobalt and zirconium as main components and the above-mentioned additional elements.

In this way, the core halves 1 and 2 were made of a composite material consisting of a core substrate 4.7 made of single-crystal manganese-zinc ferrite, and a metal magnetic thin film 6.8 formed on the sides thereof by vapor deposition or sputtering. In the magnetic head, the core substrate 4.
The wear rate of the magnetic thin film 6°8 is much faster than that of the magnetic thin film 7.

Therefore, the conventional magnetic head was designed to protect the metal magnetic thin films 6 and 8 with a core base 4.7 having excellent wear resistance.

Furthermore, if a gap is formed between the core base 4.7 and the metal magnetic thin film 6.8, dust and the like tend to accumulate, which also causes deterioration of the magnetic properties.

However, even if the core substrates 4 and 7, which have a slow wear rate, are close to the metal magnetic thin film 6.8, the surface of the metal magnetic thin film 6.8 (
Since the magnetic recording medium slides into contact with the end surface (end surface) with a certain contact pressure, it does not serve to protect the metal magnetic thin films 6 and 8.

By using the core bases 4 and 7, which have a rather slow wear rate, the metal is magnetically thin! The difference in wear rate with 6.8 becomes larger,
During use of Magnetic-\RAD, the sliding surface of the metal magnetic thin film 6.8 wears out before that of the core bases 4, 7, and the core bases 4, 7 and the metal magnetic thin film 6.8 wear out. There is a step between the two. Since the metal magnetic thin film 6.8 is thin and the core substrates 4 and 7 are arranged on both sides,
When a step is formed as mentioned above, in order to prevent wear of the sliding contact surface between the magnetic recording medium and the end face of the magnetic recording medium, approximately 1,000 people apply a carbon coating having a diamond structure to the sliding contact surface. A magnetic head formed to a certain extent has been proposed (see Japanese Patent Laid-Open No. 127214/1983).

However, a carbon film having a diamond structure is too hard and causes wear on the magnetic recording medium, which is not desirable in terms of magnetic properties.

Furthermore, since the carbon film described above is formed at high temperature and high pressure, the manufacturing equipment is severely damaged and costs increase.

Furthermore, when an amorphous metal with high saturation magnetic flux is used as a constituent material of a magnetic head, the temperature at which a carbon film having a diamond structure is formed exceeds the crystallization temperature of the amorphous metal. It has the drawback that the magnetic coating of the metal is crystallized, resulting in deterioration of the characteristics of the magnetic head.

[Problems to be solved]

The purpose of the present invention is to eliminate such drawbacks of the prior art,
To provide a magnetic head with excellent wear resistance without damaging a magnetic recording medium.

[Means for solving problems]

In order to achieve the above object, the present invention is characterized in that a graphite coating is formed on the surface of the magnetic head that comes into sliding contact with the magnetic recording medium.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIG.

This embodiment differs from the conventional example shown in FIG.
A graphite coating 10 is formed on the surface 9 of the magnetic head, in which the core half 1 and the second core half 2 are integrally joined via the magnetic gap 5, and which comes into sliding contact with the magnetic recording medium.

This graphite coating 10 is uniformly formed by the C, V, D method or sputtering method in an atmosphere of 200° C., which is below the crystallization temperature of the amorphous metal magnetic liquid 11g6.8 as described above. Contains no structured carbon.

FIG. 2 is a characteristic diagram showing the relationship between the thickness of the graphite film formed and the amount of wear. In this figure, the amount of wear indicates the difference in level between the core base made of manganese-zinc ferrite and the magnetic thin film made of nonmagnetic metal, as determined by the wear test. In addition, as a wear test, a floppy disk having a magnetic layer made of ferromagnetic metal was used, the floppy disk drive was run at a relative speed of 3.1 m/sec between the magnetic head and the disk, and the state of wear of the magnetic head was observed.

As is clear from this figure, when there are about 150 graphite coverings, the amount of wear becomes extremely small due to the good lubrication effect of graphite, and beyond that, there is almost no difference in the amount of wear. On the other hand, the graphite film thickness is 40
If the number exceeds 0, the spacing loss due to the graphite film becomes significant, resulting in a decrease in the output of the magnetic head. Therefore, it is preferable to limit the thickness of the graphite film to a range of about 150 to 400.

〔Effect of the invention〕

The present invention has the above-described structure, and since the graphite film is not as hard as the carbon film having a diamond structure as described above, it does not cause wear and tear on the magnetic recording medium, and moreover, the graphite film does not wear out the magnetic recording medium. Abrasion resistance can be improved.

Moreover, since no costly equipment for forming a carbon film having a diamond structure is required, the manufacturing cost is low. Furthermore, in the case of a magnetic head for high recording density using a magnetic thin film made of an amorphous metal, crystallization of the amorphous metal does not proceed due to the temperature at which the graphite film is formed.

Therefore, there is no concern that the characteristics of the magnetic spatula 1- will deteriorate, and the features of the amorphous metal can be fully exhibited.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic rad according to an embodiment of the present invention;
The second part is a characteristic diagram showing the relationship between graphite film thickness and wear amount in the magnetic head of the present invention, and FIG. 3 is a perspective view of a conventional magnetic head. 9... Sliding surface, 10... Graphite coating. Agent: Patent Attorney Kenji Takeshi (V)

Claims (3)

[Claims] (1) The first core half and the second core half are joined together via a magnetic gap spacer, and a graphite coating is formed on the surfaces of these core halves that come into sliding contact with the magnetic recording medium. Features a magnetic head. (2) The thickness of the graphite coating is approximately 150 to 400 mm.
The magnetic head according to claim 1, wherein the magnetic head is limited to a range of .ANG. (3) The first core half and the second core half are composed of a core half and a magnetic coating having a high saturation magnetic flux density provided on the side of the core base facing the magnetic gap spacer, and A magnetic head according to claim 1, wherein the magnetic coating is an amorphous metal.