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:
Jan. 16, 1990
Filed:
Oct. 03, 1986
Applicant:
Inventors:
Kazuhiro Saito, Toda, JP;
Taiichi Mori, Toda, JP;
Assignee:
Nippon Mining Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360126 ; 29603 ;
Abstract
A magnetic film of Fe-Si-Al alloy comprises a substrate and an Fe-Si-Al alloy film in which argon is entrapped. A thin-film laminated magnetic head comprises a pair of opposed substrates, and alternately laminated Fe-Si-Al alloy films entrapping argon therein and non-magnetic insulating films between the substrates. In the magnetic film and the head the substrates have a thermal expansion coefficient lower than that of the Fe-Si-Al alloy films and the amount of argon entrapped in the alloy films is controlled within the range of about 0.01 to about 0.3 wt. % so that internal stresses in the alloy films are substantially zeroed.