Stock material or miscellaneous articles – All metal or with adjacent metals – Having magnetic properties – or preformed fiber orientation...
Patent
1992-01-17
1994-05-31
Zimmerman, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Having magnetic properties, or preformed fiber orientation...
428634, 428652, 428667, 428928, 428612, G11B 566, G11B 572, G11B 582
Patent
active
053168640
ABSTRACT:
A sputtered magnetic recording disk is formed by a series of sequential sputtering processes within an environment of a low pressure inert gas. A disk substrate is abraded to provide a circumferential texturing of hills and valleys. The height of the hills and valleys are of a dimension not to interfere with a fly characteristic of a recording head, while the arithmetic average of the radial roughness is still sufficient to provide a magnetic switching field distribution of less than 0.20. A chromium nucleating layer is deposited on the textured substrate surface by a first sputtering process. A second sputtering process provide a magnetic layer of a cobalt alloy to provide C-axis orientation parallel to the substrate. A third sputtering process provides a protective carbon film. The output of any signal recorded on the magnetic thin film layer will have an amplitude modulation of less than twenty-five percent (25%).
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