Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-08-27

1987-08-25

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

427128, 427131, 428216, 428328, 428329, 428694, 428215, 428900, G11B 5706

Patent

active

046892630

ABSTRACT:
A magnetic recording medium comprising a substrate and magnetic recording double-layers formed on the substrate, wherein the magnetic material of the magnetic recording under-layer is composed essentially of an alloy or metal magnetic powder having a specific surface area of at most 30 m.sup.2 /g as measured by BET method, and the magnetic material of the magnetic recording top-layer is composed essentially of an iron oxide or Co-adsorbed iron oxide powder having a specific surface area of at least 25 m.sup.2 /g as measured by BET method.

REFERENCES:
patent: 4410590 (1983-10-01), Kawahara
patent: 4439796 (1984-03-01), Kitamoto
patent: 4506000 (1985-03-01), Kubota
patent: 4624883 (1986-11-01), Yamaguchi
patent: 4624894 (1986-11-01), Kishimoto

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