JPH03280206A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress the deterioration in electromagnetic conversion characteristics by forming the poles of a head element of 'Permalloy(R)' alloy bodies and 'SENDUST(R)' alloy bodies and exposing the front end faces of the 'SENDUST(R)' alloy bodies on a gap surface. CONSTITUTION:The head element 1 of the magnetic head A consists of a material such as, for example, alumina, and the poles 2 consisting of high permeability metallic film are embedded therein. The poles 2 are formed of the 'Permalloy(R)' alloy bodies 3 and the 'SENDUST(R)' alloy bodies 4. Of these, the 'SENDUST(R)' alloy bodies 4 are set at sizes of 2 to 5mum thickness and the front end faces are exposed on the gap surface. The wear resistance of the poles is enhanced in this way and the deterioration in the electromagnetic conversion characteristics by the wear of the pole is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head suitable for use in, for example, a large-capacity external storage device of a computer.

[Conventional technology]

In recent years, thin-film magnetic heads have been widely adopted as magnetic heads because they have advantages such as not requiring winding work and being capable of high-speed operation in terms of performance.

Conventionally, this type of magnetic head includes a head element having a pole made of a high magnetic permeability metal film.

By the way, the pole materials in conventional magnetic heads include:
Permalloy is usually used.

[Problem to be solved by the invention]

However, in conventional magnetic heads, the pole material is made of permalloy with a Vickers hardness of 132, which has lower hardness than ferrite, etc., and the pole wears out due to sliding contact with dust, causing electromagnetic conversion. There was a problem that the characteristics deteriorated.

The present invention has been made in view of the above circumstances, and provides a magnetic head that can prevent pole wear due to sliding contact with dust, etc., and thereby suppress deterioration of electromagnetic conversion characteristics due to pole wear. This is what we provide.

[Means to solve the problem]

The magnetic head according to the present invention includes a head element having a pole made of a high magnetic permeability metal film, and the pole of the head element is formed of a permalloy alloy body and a sendust alloy body, and the tip surface of the sendust alloy body is formed with a gap. It is exposed on the surface.

[For production]

In the present invention, the wear resistance of the pole can be improved by exposing the sendust alloy body to the gap surface.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a sectional view taken along line II in FIG. 2, and FIG. 2 is a plan view showing the entire magnetic head according to the present invention.
Reference numeral 1 designates the head element of the magnetic head A, which is made of a material such as alumina, and has a pole 2 made of a high magnetic permeability metal film embedded therein. This pole 2 is formed of a permalloy alloy body 3 and a sendust alloy body 4. Among these, the sendust alloy body 4 is set to have a thickness of 2 to 5 μm, and its tip end surface is exposed to the gap surface. As the Sendust alloy body 4, an alloy body having a Vickers hardness of 500, for example, is used.

In the magnetic head configured in this manner, the wear resistance of the pole 2 can be increased by exposing the sendust alloy body 4 on the gear surface, thereby preventing wear of the pole 2 due to sliding contact with dust, etc. be able to.

Note that the thin film magnetic head of the present invention and the conventional thin film magnetic head are CSS <Contact Start Stop).
When the reproduction outputs are compared, it can be seen from FIG. 3 that the former exhibits a more stable reproduction output than the latter. In this case, the thin film magnetic head of the present invention has a C8S frequency of 1, for example.
In the 0' cycle, there is almost no decrease in the reproduction output, but in the conventional thin film magnetic head, the reproduction output decreases by 15%.

〔Effect of the invention〕

As explained above, according to the present invention, the head element is provided with a pole made of a high magnetic permeability metal film, and the pole of the head element is formed of a permalloy alloy body and a sendust alloy body. Since the tip end surface of the pole is exposed on the gap surface, the wear resistance of the pole can be reliably improved. Therefore, since it is possible to prevent the pole from being worn out due to sliding contact with dust, for example, it is possible to suppress deterioration of electromagnetic conversion characteristics due to pole wear.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the line 1-1 in FIG. 2, FIG. 2 is a plan view showing the entire magnetic head according to the present invention, and FIG. 3 is a diagram showing the number of C8S in the magnetic head of the present invention and the conventional magnetic head. FIG. 3 is a diagram showing the relationship with reproduction output. ■... ・Head element, 2...Pole,
3... Permalloy alloy L 4... Sendust alloy body, A... Magnetic head.

Claims (1)

[Claims] It is characterized by a head element having a pole made of a high magnetic permeability metal film, the pole of this head element being formed of a permalloy alloy body and a sendust alloy body, and the tip surface of the sendust alloy body is exposed to the gap surface. magnetic head.