JPH05217142A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To increase mechanical strength and regenerate small inductance and high density record by cladding a metal magnetic substance thin film on one side of a nonmagnetic substrate and fixing it with a slider groove as a magnetic head core. CONSTITUTION:Since a substrate 1 is a strength member, it is acceptable to increase the thickness of the substrate, which makes possible to increase the strength. There is no need to increase the thickness of a metal magnetic thin film 2 more than required and provides a magnetic head which enables small inductance and high density record. The magnetic permeability of the film 2 is higher than ferrite while its saturation magnetic flux density is also higher and effective to a record medium having high magnetic force holding power. (In the case of ferrite core, it is effective to a record medium having a magnetic force holding power of at least about 900 oersted at the maximum. However, if a sendust thin film is formed on the substrate 1, it will be effective to a record medium which exceeds the maximum 1500 oersted.) The strength of winding window structure of the magnetic head is increased in this manner while the impedance is minimized so that high density record may be available. It is also effective to a record medium having a high magnetic force holding power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mainly used in a hard disk drive of a computer, that is, a plurality of protruding rails are formed in the disk traveling direction on a disk facing surface of a slider having a magnetic head body mounted thereon. The present invention relates to a flying magnetic head for recording / reproducing by forming a minute air gap between the protruding rail and a recording medium.

[0002]

2. Description of the Related Art FIG. 3A is a perspective view showing an example of a floating magnetic head, and FIG. 3B is a perspective view showing the structure of a magnetic head core used in the magnetic head. In this magnetic head, a plurality of protruding rails 5a are usually provided on the disk facing surface of a slider 5 made of ceramic such as calcium titanate.
A magnetic head core 6 is formed along a running direction X of a hard disk (a magnetic disk having a magnetic recording film formed on a metal disk such as aluminum) which is a recording medium, and a tail end portion of the slider 5 in the hard disk running direction X. It will be installed.
The magnetic head core 6 is fitted in the groove 5b provided in the slider 5 and welded by the glass 7.

As shown in FIG. 3B, the core 6 has a C-
The C-shaped cores 6a and 6b (or C-I type) are combined with the gap material 9 interposed therebetween.
This magnetic head has cores 6a, 6
After b is fitted and welded with the glass 7, the winding 8 is wound by hand. The reason why the winding 8 cannot be wound around the core 6 before being fitted into the groove 5b is that the coating of the winding 8 is burned by heat during the welding by the glass 7. As described above, since the winding 8 is manually wound and the core 6 is not cracked due to the difference in the thermal expansion coefficient during the welding by the glass 7, the width W of the core 6 ensures the mechanical strength. 8
The thickness is about 0 μm to 100 μm. The track width T is ground to about 8 μm to 12 μm.

[0004]

As described above, the conventional core 6 made of ferrite needs to have a thickness of about 80 μm to 100 μm in order to secure mechanical strength.
However, the core having such a material and thickness has a large inductance, which makes it difficult to meet the recent demand for high-density recording / reproducing. That is, since high-density recording is performed, even if an attempt is made to pass a signal current having a higher frequency ω to the winding 8, since the inductance L is large, the reactance ωL is large, and it is possible to flow at a predetermined wave height. In addition, the transfer rate of the reproduction signal becomes slow during reproduction.

In view of the above problems, it is an object of the present invention to provide a flying magnetic head which can ensure the mechanical strength, has a small inductance, and can meet the demand for high density recording / reproducing.

[0006]

To achieve this object, according to the present invention, a magnetic head core is attached to a slider having a plurality of protruding rails, and a minute air gap is provided between the protruding rails and a recording medium. In a floating magnetic head that is formed and used for recording and reproduction, one side of a substrate made of a non-magnetic material
A magnetic head core formed by depositing a metal magnetic thin film is fixed to a groove of a slider.

[0007]

The floating magnetic head of the present invention has the above-mentioned structure. The non-magnetic substrate forming the core acts as a strength member, and the metal magnetic thin film acts as a magnetic path for transferring a recording / reproducing signal. .

[0008]

1A is a perspective view showing an embodiment of a floating magnetic head according to the present invention, and FIG. 1B is a perspective view showing the structure of a magnetic head core used in the magnetic head. In the present invention, as the magnetic head core 3, a substrate 1 made of a non-magnetic material such as calcium titanate, a metal magnetic thin film 2 made of sendust, permalloy, iron-nickel system, iron-cobalt system, amorphous magnetic metal or the like. To
It is formed by a film forming technique such as sputtering or vapor deposition. These cores 3 are C as shown in FIG.
After the magnetic core chips 3a and 3b for forming a magnetic gap are formed into a C-shape or a C-I shape, silicon dioxide is formed on one or both of the core chips 3a and 3b. A gap material 9 such as the above is applied, fitted in the groove 5b of the slider 5 and welded by the glass 7. As a specific example, as the substrate 1, the calcium titanate having a strength higher than that of ferrite is used, the thickness thereof is 100 μm, and the metal magnetic thin film 2 is 5 μm thereon.
It was formed and its thickness was taken as the track width.

With such a structure, since the substrate 1 only serves as a strength member, it is possible to increase the thickness and provide a strong substrate. Further, the metal magnetic thin film 2 does not need to be unnecessarily thick, and a magnetic head having a small inductance and capable of high density recording can be provided. In addition, the magnetic metal thin film 2 has a higher magnetic permeability than ferrite and a higher saturation magnetic flux density, and is effective for a recording medium having a higher coercive force than before (in the case of a ferrite core, the maximum 90%).
It is effective for a recording medium having a coercive force of about 0 Oersted, but when the sendust thin film is formed on the substrate 1, it is effective for a recording medium having a maximum coercive force of 1500 Oersted or more).

FIG. 2 is a perspective view showing another embodiment of the present invention. The core 3A of this embodiment has a laminated structure in which an insulating film 4 is sandwiched between metal magnetic thin films 2 (the thin film 2 has two or more layers). By adopting a structure, eddy current loss is reduced and higher frequency signals can be accommodated. In the example,
Calcium titanate is used as the non-magnetic substrate 1, its thickness is 100 μm, and the metal magnetic thin film 2 is 4 μm thereon.
m 2 silicon oxide 4 500 Å, metal magnetic thin film 2 4 μm
It was formed sequentially. According to this embodiment, higher density recording is possible.

In the present invention, ceramic can be used as the slider 5, but magnetic ferrite can be used as the slider 5 to shield noise from peripheral equipment.

[0012]

According to the first aspect of the present invention, the strength of the winding window structure of the magnetic head is increased and the impedance of the magnetic head is reduced, and it is possible to provide a magnetic head which can meet the demand for high density recording. Further, the saturation magnetic flux density is higher than that of the conventional ferrite core, which is effective for a recording medium having a high coercive force.

According to the second aspect, by using the magnetic ferrite as the slider, noise from peripheral devices can be shielded, and a highly reliable magnetic head can be provided.

[Brief description of drawings]

FIG. 1A is a perspective view showing an embodiment of a floating magnetic head according to the present invention, and FIG. 1B is a perspective view showing the structure of a magnetic head core used in the magnetic head.

FIG. 2 is a perspective view of a magnetic head showing another embodiment of the present invention.

FIG. 3A is a perspective view showing a conventional floating magnetic head, and FIG. 3B is a perspective view showing the structure of a magnetic head core used in the magnetic head.

[Explanation of symbols]

 1 non-magnetic substrate 2 metal magnetic thin film 3, 3A core 3a, 3b core chip 4 insulating film 5 slider 5b groove 7 glass 8 winding 9 gap material

Claims (2)

[Claims] 1. A flying magnetic head in which a magnetic head core is attached to a slider having a plurality of projecting rails, and a minute air gap is formed between the projecting rails and a recording medium to perform recording / reproduction. A flying magnetic head, comprising a magnetic head core formed by coating a metal magnetic thin film on one surface of a substrate made of a material, and fixed in a groove. 2. The slider according to claim 1, wherein:
A flying magnetic head characterized by using magnetic ferrite.