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:
Nov. 24, 1998
Filed:
Apr. 02, 1997
Applicant:
Inventors:
Rajiv Yadav Ranjan, San Jose, CA (US);
Miaogen Lu, Fremont, CA (US);
Assignee:
Komag, Incorporated, Milpitas, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428 653 ; 428336 ; 428611 ; 428668 ; 428673 ; 428674 ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 427131 ; 427132 ; 2041972 ;
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.