JPH0991614A - Magnetic head and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the appearance of the adverse influence of a contour effect by constituting the recording medium-facing part of a first magnetic core half body of a ferromagnetic oxide material and ferromagnetic metallic film and constituting of the magnetic path of the part wound with the winding of this half body of a ferromagnetic metallic thin film on a glass material. SOLUTION: This magnetic head is constituted by butting and joining the first magnetic core half body, the magnetic path of which is composed of the composite of the ferromagnetic oxide material 51 and the ferromagnetic metallic thin film 53, against and to a second magnetic core half body 5b via a gap spacer 8 and subjecting the first magnetic core half body to winding. The recording medium-facing part of the first magnetic core half body of the magnetic head is composed of both of the ferromagnetic oxide material 51 and the ferromagnetic metallic thin-film 53. The magnetic path of the first magnetic core half body is composed of only the ferromagnetic metallic thin-film 53 formed on the first glass material 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used for recording / reproducing information signals in an HDD (hard disk drive) as an external storage device of a computer.

[0002]

2. Description of the Related Art A magnetic head slider as shown in FIG. 8 is often used for recording / reproducing information signals in an HDD device. This magnetic head slider is made of CaTiO 3.
_In the slit 4 provided on the rear side in the relative traveling direction with respect to the magnetic disk of the slider main body 1, which is made of a non-magnetic material such as 3 and has air bearing portions 2 and 3 for slightly traveling above the magnetic disk for relative traveling. A magnetic head 5 for recording / reproducing is inserted and fixed by a glass material 6, and a winding 7 is provided on the magnetic head 5 for practical use.

In such a magnetic head slider, H
With the increase in the frequency of the recording / reproducing signal in the DD system,
There has been a demand for lowering the inductance of the magnetic head 5.

An example of the structure of the magnetic head 5 is shown in FIG. In this magnetic head, a pair of magnetic core halves 5a and 5b made of a magnetic material are opposed to each other via a gap spacer 8 and joined and reinforced by a glass material 9. The magnetic core halves 5a and 5b are: Ferromagnetic metal thin films 52a and 52b are adhered to the gap facing portions of the magnetic core half body members 51a and 51b made of a ferromagnetic oxide.

In order to reduce the inductance of the magnetic head, it is effective to narrow the width (w shown in FIG. 9) of the winding winding portion of the magnetic core half member, but it is excessively narrow. Then, the mechanical strength of the winding winding portion is lowered, and there is a possibility that the winding portion may be damaged during the manufacturing process of the magnetic head, the assembling process to the slider, the winding process, or the like.

On the other hand, as another means for reducing the inductance, as shown in FIG. 10, the magnetic core half on the winding winding side is constituted by a ferromagnetic metal thin film 53 on a non-magnetic substrate 59. However, in this configuration, it becomes difficult to set the thickness (t in the figure) of the ferromagnetic metal thin film on the non-magnetic substrate to be larger than the longest recording wavelength of the signal on the recording medium. The so-called contour effect problem occurs.

[0007]

SUMMARY OF THE INVENTION The present invention clarifies the structure of a magnetic head which has a low inductance but does not adversely affect the contour effect, is mechanically strong, and is excellent in productivity.

[0008]

In the magnetic head according to the present invention, the first magnetic core half body in which the magnetic path is formed by the composite of the ferromagnetic oxide material and the ferromagnetic metal thin film has the gap spacer. In a magnetic head, which is butt-joined with a second magnetic core half body via a magnetic field and is wound on the first magnetic core half body, the recording medium facing portion of the first magnetic core half body is ferromagnetic. The magnetic path of the winding winding part of the first magnetic core half is composed of both an oxide material and a ferromagnetic metal thin film,
It is characterized in that it is composed only of a ferromagnetic metal thin film formed on a glass material, and the manufacturing method is a step of forming a groove filled with a glass material on a substrate made of a ferromagnetic oxide material. A step of forming a ferromagnetic metal thin film on the upper surface of the substrate including the upper surface of the groove, a substrate on which the ferromagnetic metal thin film metal thin film is formed, and a magnetic member to be the other magnetic core half body with a gap spacer. It is characterized by comprising a step of butt-joining via a groove and a step of grinding and removing the ferromagnetic oxide material on the bottom surface side of the groove.

According to the configuration and the manufacturing method of the present invention, the first
Since the recording medium facing portion of the magnetic core half body is composed of both the ferromagnetic oxide material and the ferromagnetic metal thin film, the adverse effect of the contour effect does not appear, and the winding winding portion of the first magnetic core half body does not appear. Since the magnetic path is composed only of the ferromagnetic metal thin film, the inductance is small, and the glass material is arranged on the winding winding portion of the first magnetic core half body, so that the mechanical strength of the winding winding portion is improved. Reserved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The structure of a magnetic head according to the first embodiment of the present invention is shown in FIG. In this magnetic head, a magnetic path is formed by a composite of a ferromagnetic oxide material 51 made of Mn-Zn ferrite or the like and a ferromagnetic metal thin film 53 made of Fe-Ta-N-based alloy or Fe-Al-Si-based alloy. In the magnetic head in which the first magnetic core half body thus constructed is butt-joined to the second magnetic core half body 5b through the gap spacer 8 and winding is applied to the first magnetic core half body, The recording medium facing portion of the first magnetic core half is composed of both the ferromagnetic oxide material 51 and the ferromagnetic metal thin film 53, and the magnetic path of the winding winding portion of the first magnetic core half is the first. It is composed of only the ferromagnetic metal thin film 53 formed on the glass material 50.

The second magnetic core half body 5b is M
A magnetic path is formed by a composite of a ferromagnetic oxide material 51b made of n-Zn ferrite or the like and a ferromagnetic metal thin film 52b made of Fe-Ta-N-based alloy or Fe-Al-Si-based alloy. Yes, 9 is a second glass material filled in the tip of the winding hole to reinforce the gap butt joint.

When this magnetic head is incorporated into a slider as shown in FIG. 8 and put into practical use, as shown in FIG. 2, the magnetic head facing portion of the magnetic head is subjected to grinding or the like. Thus, the track width T is regulated. Alternatively, the track width may be regulated by incorporating the magnetic head into a slider and then subjecting the recording medium facing surface to ion beam etching.

The magnetic head shown in FIG. 1 is manufactured through the following steps.

That is, first, as shown in FIG. 3, a groove is formed in a substrate made of a ferromagnetic oxide material 51, and the groove is filled with a first glass material 50.

Next, as shown in FIG. 4, a ferromagnetic metal thin film 53 is formed on the entire upper surface of the substrate including the upper surface of the groove,
As shown in FIG. 5, if necessary, the ferromagnetic metal thin film 5
The plane shape of 3 is regulated.

Next, as shown in FIG. 6, this substrate and the second substrate 5b ', which is the other half of the magnetic core, are opposed to each other via a gap spacer, and are heated while being pressed to the side of the second substrate. The two substrates are joined by softening or melting the second glass material 9.

Finally, the bottom surface side of the groove filled with the first glass material 50 is ground or polished until it reaches the broken line AA in FIG. 6, and sliced along the broken line BB to obtain a recording medium. The magnetic head shown in FIG. 1 is obtained by grinding or polishing the opposite surface side up to the broken line C-C.

A magnetic head according to the second embodiment of the present invention may have a structure as shown in FIG.
In the first magnetic core half of this magnetic head, the recording medium facing portion is composed of both the ferromagnetic oxide material 51 and the ferromagnetic metal thin film 53, and the winding winding portion and the magnetic path behind it are glass materials. It is characterized in that it is constituted by only the ferromagnetic metal thin film 53 formed on the 50.

[0020]

As described in detail above, according to the present invention,
Provided is a magnetic head which has a low inductance but does not adversely affect the contour effect, is mechanically strong, and is excellent in productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic head according to a first embodiment of the present invention in which a track width regulation process is performed.

FIG. 3 is a perspective view (No. 1) of the substrate for explaining the method of manufacturing the magnetic head according to the first embodiment of the present invention.

FIG. 4 is a perspective view (No. 2) of the substrate for explaining the method of manufacturing the magnetic head according to the first embodiment of the present invention.

FIG. 5 is a perspective view (No. 3) of the substrate for explaining the method of manufacturing the magnetic head according to the first embodiment of the present invention.

FIG. 6 is a perspective view (No. 4) of the substrate for explaining the method of manufacturing the magnetic head according to the first embodiment of the present invention.

FIG. 7 is a perspective view of a magnetic head according to a second embodiment of the present invention.

FIG. 8 is a perspective view of a magnetic head slider in which a conventional magnetic head and a magnetic head according to an embodiment of the present invention are incorporated.

FIG. 9 is a perspective view of a first conventional magnetic head.

FIG. 10 is a perspective view of a second conventional magnetic head.

[Explanation of symbols]

 50 First Glass Material 51 Ferromagnetic Oxide Material 53 Ferromagnetic Metal Thin Film 8 Gap Spacer 9 Second Glass Material

Claims (2)

[Claims] 1. A first magnetic core half body whose magnetic path is composed of a composite of a ferromagnetic oxide material and a ferromagnetic metal thin film is butt-joined to a second magnetic core half body through a gap spacer. In the magnetic head in which the first magnetic core half body is wound, the recording medium facing portion of the first magnetic core half body is composed of both a ferromagnetic oxide material and a ferromagnetic metal thin film. The magnetic head of the first magnetic core half, wherein the magnetic path of the winding winding portion is composed only of a ferromagnetic metal thin film formed on a glass material. 2. A step of forming a groove filled with a glass material on a substrate made of a ferromagnetic oxide material, a step of forming a ferromagnetic metal thin film on an upper surface of the substrate including an upper surface of the groove, Magnetic metal thin film A step of butt-bonding a substrate on which a metal thin film is formed and the other magnetic member to be the magnetic core half body through a gap spacer, and a step of grinding and removing the ferromagnetic oxide material on the bottom surface side of the groove A method of manufacturing a magnetic head, comprising: