Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1985-11-12
1988-04-05
Lesmes, George F.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428336, 428409, 428667, 428694, 428198, 428900, 428978, G11B 1000
Patent
active
047358408
ABSTRACT:
The improved memory disk of the present invention comprises a substrate coated with chromium with preferably a layer of cobalt
ickel as the magnetic layer sealed with a protective coating of carbon. As a result of circumferential texturing, a circular anisotropic crystal growth has occurred during the sputtering with a circumferential alignment that provides an improved memory disk having a reduced amplitude modulation, an improved squareness of the hysteresis loop, e.g. lower switching field distribution and a high production relatively low cost production system. As a result, a higher recording linear bit density due to the high coercivity and low switching field distribution can be experienced with the magnetic disk of the present invention.
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Atkinson William M.
Cyberdisk, Inc.
Lesmes George F.
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