JPS6344306A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the magnetic saturation of a core piece and to permit writing to a magnetic recording medium having high coercive force by coating the surface on the sliding surface side of the core piece with a magnetic metallic film. CONSTITUTION:The surface on the sliding surface side of the core piece 6 is coated with the magnetic metallic film 10. The magnetic metallic film 10 is polished on the basis of the top surface of the slider 1 to expose a gap G until said gap is flush with an air bearing face 2A. The magnetic saturation near the gap of the core piece 6 can be prevented by selecting the material such as 'Sendust(R)' or amorphous material having a large saturation magnetic flux density as the magnetic metallic film 10. As a result, the writing to the magnetic recording medium having the high coercive force is possible.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a magnetic recording medium (in contrast to
The present invention relates to a magnetic head that performs writing and reading, and particularly to a magnetic head called a composite head in which a core piece is embedded in a non-magnetic slider or an all-glass bonding bulk type floppy head.

(Summary of the Invention) The present invention provides a magnetic head for a disk device or the like in which a core piece is integrated with a slider, etc. The surface of the core piece has /l! , a magnetic film is provided to improve writing and reading performance.

(Prior Art) FIG. 5 shows the conventional structure of a magnetic head called a Hunposite head. In this figure, a slider 1 made of a non-magnetic material such as ceramic has two mutually parallel air bearing surfaces 2 protruding from the bottom surface facing a magnetic recording medium such as a magnetic disk.
It has A and 2B. The front ends of the air bearing surfaces 2A and 2B are connected to a portion 3 of the inclined chamber 7a.
, the rear end has a 20° plane 4.

In addition, the slider 1 has a notch groove 5 for arranging the core piece that continues in the vertical direction of the slider from the rear end surface (left end surface in FIG. 5).
is formed, and a core piece (component knot piece) 6 of 7-elite or the like having a head yarn is fixed therein by glass melting by a positive N liquid part 7. The glass sealing portion 7 and the end surfaces of the core piece 6 exposed to the air bearing surface are mirror-finished.

Note that a back groove 8 is formed on the upper surface of the slider 1, and a winding groove 9 is formed so as to cross the rear end surface of the slider 1. Then, the core piece 6 is wound (illustrated! 3) using the 8-wire groove 9.

(Problems to be Solved by the Invention) Recently, there has been a tendency to use magnetic recording media with a large coercive force, but with the structure shown in FIG.
In the core piece 6 with a head gap, since the core material is a single magnetic material such as ferrite, there is a problem in that it is difficult to write on a magnetic recording medium with a high coercive force.

In addition, there is an M I G type head in which a metal magnetic material is provided only on the abutting end face portion facing the gap between each core of the core piece. Since the joint is exposed, there is an adverse effect on writing.

(Means for solving the gap point) The present invention takes into consideration the above-mentioned α;
The present invention aims to provide a magnetic head that prevents magnetic saturation of the core piece and enables writing to a magnetic recording medium with high coercive force.

The present invention solves the above-mentioned conventional problems by coating the sliding surface side surface of the core piece with a metal magnetic film in a structure in which a core piece is integrated with a slider.

(Function) In the magnetic head of the present invention, the sliding surface side surface of the core piece is coated with a metal magnetic film. By choosing the material,
Magnetic saturation near the core piece gap can be prevented. As a result, writing can be performed on a magnetic recording medium with high coercive force, and the overwriting (SN ratio) can be improved. Furthermore, since writing is possible even if the track width is narrowed, it is possible to narrow the track.

(Example) Hereinafter, an example of the magnetic head according to the present invention will be described in the case of a composite head.

FIG. 1 shows the main part structure of a completed magnetic head according to the present invention, and FIGS.

First, a ferrite core piece (composite piece) 6 having a head gap is glass-welded to the core piece arrangement groove 5 of a slider 1 made of a non-magnetic material such as ceramic using a positive sealing part 7, and then Next, the surface of the ferrite core piece 6 on the air bearing surface (sliding surface against the magnetic recording medium) side is etched with hydrochloric acid, phosphoric acid, nitric acid, or the like. At this time, the gap material (material such as glass) G forming the gap between the slider 1, the glass sealing part 7, and the core piece 6 is not etched.

Next, as shown in diagram Pt5a, a metal magnetic material is sputtered from the air bearing surface onto the core piece surface to form a metal magnetic film 10 which has a higher saturation magnetic flux density and better wear resistance than ferrite such as sendust or amorphous. however,
As it is, the metal magnetism 110 is raised above the air bearing surface 2A of the slider 1, and the slider 1 is also protruding into the lath sealing part 711111, so as shown in FIG. side)
The metal magnetic film 10 is polished to expose the gap material G, and match the original air bearing surface 2A.

As a result, as shown in Fig. 1, a composite head is created in which the entire surface of the core piece 6 on the air bearing surface side is covered with a metal magnetic film 10 that is less susceptible to magnetic saturation and has better wear resistance than ferrite, and a gap is formed with the gap material G. is obtained.

Note that the VI structure of the slider 1 and the glass sealing portion 7 may be the same as in the conventional case.

The present invention is also applicable to structures such as all-glass bonded bulk type floppy heads.

(Effects of the Invention) As explained above, according to the magnetic head of the present invention, in a structure in which a core piece is integrated with a slider, the surface on the sliding surface side of the core piece is coated with a metal magnetic film. By selecting a material such as Sengest or amorphous (non-crystalline magnetic alloy) having a large saturation magnetic flux density as the magnetic film, magnetic saturation near the gap between the core pieces can be prevented. As a result, it is possible to write on a magnetic recording medium with a high coercive force, it is possible to improve override, and furthermore, it is possible to achieve a narrow track.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, FIGS. FIG. 3 is a perspective view of the head. DESCRIPTION OF SYMBOLS 1...Slider, 2A, 2B...Air bearing surface, 5...Notch groove, 6...Core piece, 7...
Glass sealing part, 10...metal magnetic film.

Claims (2)

[Claims] (1) A magnetic head characterized in that a metal magnetic film is deposited on the sliding surface side of the core piece. (2) The magnetic head according to claim 1, wherein the metal magnetic film is made of a metal magnetic material having a higher saturation magnetic flux density than the core piece.