Thin film magnetic recording disk comprising a metallic disk bla

Details Thin film magnetic recording disk comprising a metallic disk bla Thin film magnetic recording disk comprising a metallic disk bla

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.

REFERENCES:
patent: 3110613 (1963-11-01), Bean
patent: 3864093 (1975-02-01), Wolfla
patent: 4472248 (1984-09-01), Koskenmaki
patent: 4511635 (1985-04-01), Nagao et al.
patent: 4592948 (1986-06-01), Kohmoto et al.
patent: 4828905 (1989-05-01), Wada et al.
patent: 4940511 (1990-07-01), Fontana, Jr. et al.

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