Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-03-06

1987-03-10

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428215, 428216, 428457, 428694, 428900, G11B 562

Patent

active

046490736

ABSTRACT:
In a magnetic recording disk of a double-sided recording type according to a perpendicular magnetic recording technique of the invention, recording layers having different film thicknesses are formed on two surfaces of a base layer. The film thickness of one magnetic recording layer is set to be larger than the film thickness of the other magnetic recording layer. Thus, a curl phenomenon can be prevented. In addition, a coercive force of the thicker recording layer is set to be higher than that of the thinner recording layer. A difference in a perpendicular recording density between the two recording layers due to a difference in the film thickness thereof can be compensated for.

REFERENCES:
patent: 4410583 (1983-10-01), Hanaoka et al.

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