Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-01-16

1987-01-13

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Foil or filament smaller than 6 mils

428611, 428624, 428625, 428626, 428630, 428650, 428652, 428678, 428686, 428928, 360134, 360135, B21C 3700

Patent

active

046364480

ABSTRACT:
In a magnetic recording medium particularly for perpendicular magnetization comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, a lower layer with low coercive force and high permeability, for example, of permalloy is sputtered on the substrate and an upper layer for perpendicular recording, for example, of cobalt-chromium alloy is sputtered on the lower layer, and the average grain diameter of the lower layer is less than one half of that of the upper layer.

REFERENCES:
patent: 4410603 (1983-10-01), Yamamori et al.
patent: 4439795 (1984-03-01), Kitamoto et al.
patent: 4539264 (1985-09-01), Yazawa et al.

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