Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1997-04-02
1998-11-24
Kiliman, Leszek
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428336, 428611, 428668, 428673, 428674, 428694TS, 428694TP, 428694TM, 428900, 427131, 427132, 2041972, G11B 566
Patent
active
058403949
ABSTRACT:
A method for manufacturing a magnetic disk includes the step of providing first and second magnetic layers on a substrate. The first magnetic layer comprises Co. The portion of the first magnetic layer comprising Cr, Ta, Ti, W, Zr or Hf, if any, is less than 7.5 atomic % of the first magnetic layer (and preferably less than 5 atomic %). The second magnetic layer also comprises Co, and more than 7.5 atomic % of the second layer is Cr, Ta, Ti, W, Zr or Hf (and preferably more than 10 atomic %). We have discovered that the first and second magnetic layers can be made very thin without having a great reduction in coercivity.
REFERENCES:
patent: 5543221 (1996-08-01), Kitakami et al.
patent: 5580667 (1996-12-01), Lal
patent: 5605733 (1997-02-01), Ishikawa et al.
patent: 5693426 (1997-12-01), Lee
Lu Miaogen
Ranjan Rajiv Yadav
Kiliman Leszek
Komag Incorporated
Leeds Kenneth E.
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