The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1995
Filed:
Oct. 15, 1993
James K Howard, Morgan Hill, CA (US);
Hung-Chang W Huang, San Jose, CA (US);
Cherngye Hwang, San Jose, CA (US);
Anthony W Wu, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
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.