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Flying magnetic head
| Details |
Inventors: Shimizu, Tatsushi; Aoki, Hideo; Imazeki, Nobuo;
Assignee: Nippon Mining Company, Ltd. (Tokyo, JP)
Primary Examiner: Heinz; A. J.
Assistant Examiner:
Attorney, Agent or Firm: Seidel, Gonda, Lavorgna & Monaco
A flying magnetic head is provided in which a head core, formed by laminating a magentic thin film on a non-magnetic substrate, is fitted into a slot formed in a slider through a bonding glass layer. The substrate of the head core and the slider are formed from the same material. The coefficient of thermal expansion of the head core substrate is substantially the same as that of the magnetic thin film. The thickness of the bonding glass layer which bonds the head core to the slider is reduced to 20 .mu.M or less. |
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DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide a composite flying magnetic head with a laminated thin film core being used as a head core which eliminates an unbalanced wear between a slider and a non-magnetic substrate of a head core, which allows the surface area of a bonding glass layer to be reduced and, hence, the amount of dust adhered to that surface to be reduced, which improves CSS withstanding ability, and which allows a stress applied to a magnetic material to be reduced to achieve improved head characteristics.
To this end, the present invention provides a flying magnetic head in which a head core, formed by laminating a magnetic thin film on a non-magnetic substrate, is fitted into a slot formed in a slider through a bonding glass layer.
This flying magnetic head is characterized in that the substrate of the head core and the slider are made of the same material, in that a coefficient of thermal expansion of the substrate of the head core is substantially the same as that of the magnetic thin film, and in that the thickness of the bonding glass layer which bonds the head core to the slider is reduced to 20 .
mu.
m or less.
In a preferred form, the substrate of the head core and the slider are made of a ceramic material expressed by CoxNi.
sub.
2 -xO.
sub.
2 (where 0.
2.
ltoreq.
X.
ltoreq.
1.
8), and the magnetic thin film is made of Fe-Si-Al alloy.
In the ceramic material from which the substrate of the head core and the slider are manufactured and which has a basic composition consisting of CoO and NiO, at least 0.
1 to 5% by weight of one selected from the group consisting of MnO, TiO.
sub.
2, Al.
sub.
2 O.
sub.
3 and CaO may be present.
At least one selected from the group consisting of 1 to 5% by weight of Y.
sub.
2 O.
sub.
3, 0.
1 to 1% by weight of TiN, and 0.
3 to 2% by weight of B.
sub.
2 O.
sub.
3 may also be present.
Furthermore, the substrate of the head core and the slider may also be made of a mixed ceramic which has a basic composition consisting of 30 mol % or less of MgO, 30 mol % or less of CaO, and a balance of CoO and NiO which exist in the form of CoxNi
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Metal Working 
