G - Physics – 11 – B
Patent
G - Physics
11
B
117/24.2, 352/31
G11B 5/62 (2006.01) G11B 5/64 (2006.01) G11B 5/73 (2006.01) H01F 10/16 (2006.01) H01F 41/14 (2006.01)
Patent
CA 1269894
Abstract of the Disclosure An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coer- civity substantially greater than prior CoPt thin film metal alloy media. A tungsten underlayer between the substrate and the CoPt magnetic layer improves the coercivity above that of media with conventional underlayers, such as chromium. The coercivity of the CoPt layer can be increased even further if the CoPt film is deposited in such a manner as to form an intermetallic compound of Co3W in the interface region between the tungsten underlayer and the CoPt magnetic layer. The tungsten underlayer also improves the magnetic properties of the media when the magnetic layer is an alloy of cobalt-platinum-chromium (CoPtCr).
532014
Ahlert Richard H.
Howard James K.
Lim Grace S.
Ahlert Richard H.
Howard James K.
International Business Machines Corporation
Kerr Alexander
Lim Grace S.
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