Thin-film storage disk and method

Details Thin-film storage disk and method Thin-film storage disk and method

C - Chemistry, Metallurgy

23

C

352/31.3

C23C 14/00 (2006.01) C23C 14/04 (2006.01) G11B 5/64 (2006.01) G11B 5/84 (2006.01) G11B 5/851 (2006.01) H01J 29/06 (2006.01)

Patent

CA 1261465

- 40 - THIN-FILM STORAGE DISK AND METHOD Abstract A method of producing a thin-film magnetic disk having high coercivity and magnetic remanence, good loop squareness, and low fluctuation in peak-to-peak recording signal amplitude over an entire circular recording path. The novel aspects of the method which contribute to the performance characteristics of the disk are (a) layering a 300-1,000 .ANG. magnetic film containing between about 70-88% cobalt, 10-28% nickel, and 2-12% chromium over a 1,000-4,000 .ANG. chromium underlayer; (b) forming the film and underlayer under sputtering deposition conditions which prevent low-angle asymmetrical sputtering; and (c) shielding the disk substrate during sputtering in a manner which produces substantially uniform-thickness deposition.

503053

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