Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-03-06

1987-03-24

Lesmes, George F.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

478212, 478215, 478216, 478457, 478694, 478900, G11B 562

Patent

active

046524797

ABSTRACT:
In a magnetic recording disk of a double-sided data 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, thereby preventing a curl phenomenon. In addition, a coercive force of the thicker recording layer is set to be smaller than that of the thinner layer. Thus, differences in a reproduction output voltage and an optimal recording current between the two recording layers of the disk due to a film thickness difference can be compensated for.

REFERENCES:
patent: 4323621 (1982-04-01), Kober et al.
patent: 4410583 (1983-10-01), Hanaoka

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