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:
Jun. 28, 1994
Filed:
Feb. 18, 1992
Applicant:
Inventors:
Brij B Lal, San Jose, CA (US);
Atef H Eltoukhy, Saratoga, CA (US);
Assignee:
HMT Technology Corporation, Fremont, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; H01F / ;
U.S. Cl.
CPC ...
428610 ; 428611 ; 428668 ; 428634 ; 428928 ;
Abstract
A magnetic thin-film disc having a magnetic thin film formed of a lower and upper sublayers. The two sublayers are characterized by lower coercivity, smaller grains, and more isolated grains in the lower sublayer, and higher coercivity, and larger grains in the upper sublayer. In one embodiment, the sublayers are characterized by an increasing magnetic remanence on progressing from the outer to the inner diameter of the disc. Also disclosed are sputtering methods for producing the disc.