EP 0213191 A4 19880427 - THIN-FILM STORAGE DISK AND METHOD.
Title (en)
THIN-FILM STORAGE DISK AND METHOD.
Title (de)
DÜNNFILMLAGERPLATTE UND VERFAHREN.
Title (fr)
DISQUE MEMOIRE A COUCHE MINCE ET PROCEDE.
Publication
Application
Priority
- US 70673785 A 19850228
- US 81422985 A 19851227
Abstract (en)
[origin: WO8605214A1] A method of producing a thin-film magnetic disk (starting with substrates 28 and 30 in Figure 1) 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 A &cir& o magnetic film containing between about 70-88% cobalt, 10-28% nickel, and 2-12% chromium over a 1,000-4,000 A &cir& o 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.
IPC 1-7
IPC 8 full level
C23C 14/14 (2006.01); C23C 14/04 (2006.01); C23C 14/34 (2006.01); G11B 5/64 (2006.01); G11B 5/84 (2006.01); G11B 5/851 (2006.01)
CPC (source: EP)
C23C 14/044 (2013.01); G11B 5/84 (2013.01); G11B 5/851 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 8605214 A1 19860912; CA 1261465 A 19890926; EP 0213191 A1 19870311; EP 0213191 A4 19880427; JP H0668147 B2 19940831; JP S62501978 A 19870806
DOCDB simple family (application)
US 8600414 W 19860226; CA 503053 A 19860228; EP 86901705 A 19860226; JP 50138986 A 19860226