Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1993-10-15
1995-07-25
Resan, Stevan A.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428141, 428336, 428469, 428693, 428694TS, 428694ST, 428694SG, 428697, 428702, 428900, 428938, G11B 500
Patent
active
054360471
ABSTRACT:
A magnetic recording disk has an improved surface film formed on the disk blank. A sputter-deposited surface coating containing nickel, chromium and oxygen (Ni--Cr--O) is formed on a AlMg disk blank, after which a cobalt alloy magnetic layer is formed over the Ni--Cr--O coating and a protective overcoat is formed over magnetic layer. The use of the Ni--Cr--O coating on the disk blank eliminates the need for a wet electroless deposition process for creation of a surface coating and results in an inherent texturing of the subsequently deposited magnetic film and protective overcoat which conform to the surface texture of the sputter-deposited Ni--Cr--O. The disks made with the Ni--Cr--O surface film exhibit a very low static friction force between the air-bearing slider and the disk surface when the disks are used in contact start/stop (CSS) disk files.
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Howard James K.
Huang Hung-Chang W.
Hwang Cherngye
Wu Anthony W.
Berthold Thomas R.
International Business Machines - Corporation
Resan Stevan A.
Wilson James C.
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