Non-magnetic substrate material
AssigneesHitachi Metals, Ltd., Hitachi, Ltd.
InventorsMasahiko Sakakihara, Kenzi Hasegawa, Akira Iwama
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Abstract
A thin film magnetic material assembly for a magnetic head which has a non-magnetic substrate material and a magnetic metallic film vapor deposited thereon. The substrate material has a thermal coefficient of expansion approximating that of the magnetic metallic film. The substrate has a NaCl lattice structure and a composition represented by the formula Ni.sub.x Mn.sub.2-x O.sub.2 where 0.25.ltoreq.x<1. The substrate can optionally contain not more than 10% by weight of at least one of the group Al, Cr, Si, Sn, Ba as a secondary component. The magnetic metallic film most suitable in connection with the present invention is Fe-Ni, Fe-Al-Si or similar based alloys.
Claims6
A thin film magnetic assembly for a magnetic head, said assembly comprising a non-magnetic substrate material and a magnetic metallic film vapor-deposited on the substrate material, wherein the substrate material has a thermal expansion coefficient approximating that of the magnetic metallic film, a NaCl-type lattice structure and a nickel-manganese oxide composition represented by the formula:
- Ni.sub.x Mn.sub.2-x O.sub.2
- wherein 0.05.ltoreq.x<1, said composition optionally containing not more than 10% by weight of at least one individual element of the group consisting of Al, Cr, Si, Sn and Ba as a secondary component on the basis of said nickel-maganese oxide.
Dependencies are inferred from the claim text.