Stock material or miscellaneous articles – All metal or with adjacent metals – Having magnetic properties – or preformed fiber orientation...
Patent
1984-04-25
1985-11-12
Rutledge, L. Dewayne
Stock material or miscellaneous articles
All metal or with adjacent metals
Having magnetic properties, or preformed fiber orientation...
428652, 428667, 428680, 428928, 360135, 204192M, G11B 566, G11B 582, C23C 1500
Patent
active
045528209
ABSTRACT:
A thin-film disc fabrication method and structure contemplates a sputtered undercoat. An aluminum base is subjected to a fine polishing step, and a relatively thin undercoat is deposited by sputtering. The preferred undercoat is a 0.3-3 micron layer of nickel-vanadium alloy (on the order of 7% vanadium). The preferred recording layer is a sputtered composite structure comprising a layer of chromium and an overlying layer of a cobalt-chromium alloy. Modulation effects can be substantially eliminated by heating the aluminum base prior to sputtering the nickel-vanadium undercoat, and by oxidizing the undercoat prior to deposition of the overlying layers.
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"RF-Sputtered Chromium-Cobalt Films for High-Density Longitudinal Magnetic Recording", W. T. Maloney, IEEE Transactions on Magnetics, vol. Mag.-15, No. 6, Nov. 1979, pp. 1546-1548.
"Effect of Ion Bombardment During Deposition on Magnetic Film Properties, L. F. Herte, A. Long, Jr., Journal of Vacuum Science Technology 18(2), Mar. 1981, pp. 153-155.
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Ballard Nathan T.
Lee John T.
Lin Yeong S.
Teng Edward F.
Lin Data Corporation
Rutledge L. Dewayne
Zimmerman John J.
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