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:
Apr. 28, 1998
Filed:
Oct. 22, 1992
Applicant:
Inventors:
Brij Bihari Lal, San Jose, CA (US);
Tadashi Shinohara, Fremont, CA (US);
Assignee:
HMT Technology Corporation, Fremont, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428611 ; 428928 ; 428667 ; 428666 ;
Abstract
A magnetic thin-film medium characterized by high coercivity, loop squareness, and signal-to-noise ratio characteristics. The medium includes a disc-like substrate, a sputtered Cr underlayer having a thickness between 100-300 .ANG., and a sputtered Co alloy magnetic thin-film layer having a thickness between 250-800 .ANG.. The sputtered Cr and magnetic layers are preferably formed under sputtering conditions in which a negative bias of between -50 to -600 volts is applied to the substrate.