Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1995-08-15

1999-05-25

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428 653, 428694T, 428694TS, 428694ST, 428900, G11B 582

Patent

active

059068841

ABSTRACT:
A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.

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patent: 5374462 (1994-12-01), Funaki et al.
patent: 5401572 (1995-03-01), Uchiyama et al.
patent: 5431804 (1995-07-01), Caballero

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