Magnetic disc

Details Magnetic disc Magnetic disc

1994-10-14

1997-03-04

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 655, 428 657, 428336, 428666, 428667, 428694T, 428694TS, 428694TP, 428694TM, 428900, G11B 566

Patent

active

056077408

ABSTRACT:
A magnetic disc according to this invention is of a structure in which underlying layer and magnetic layer are formed in succession on non-magnetic substrate, and one non-magnetic intermediate layer or more and one second magnetic layer or more are further stacked one after another thereon. The non-magnetic intermediate layer is formed as film layer by sputtering, and film thickness calculated by film formation rate and film formation time is 0.2 nm.about.1.0 nm. Thus, with this magnetic disc, coercive force is improved. Accordingly, signals can be recorded at higher density. As a result, application to magnetic disc devices of larger memory capacity can be made.

REFERENCES:
patent: 4748628 (1988-06-01), Ahlert
patent: 4920013 (1990-04-01), Koboyoshi
patent: 5051288 (1991-09-01), Ahlert
patent: 5227212 (1993-07-01), Ahlert

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