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. 29, 2004
Filed:
Feb. 20, 2002
Applicant:
Inventors:
Yoshibumi Matsuda, Hiratsuka, JP;
Koji Sakamoto, Odawara, JP;
Tetsuya Kanbe, Odawara, JP;
Yotsuo Yahisa, Odawara, JP;
Assignee:
Hitachi Storage Technologies Japan, Ltd., Kanagawa-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ;
U.S. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ;
Abstract
A magnetic recording medium includes a first underlying film of a NiTa alloy having a nonmagnetic amorphous structure and formed on a nonmagnetic substrate, and a second underlying film made of an alloy containing Cr and Ti, further a first magnetic film of a CoCrPt alloy, a nonmagnetic intermediate film of Ru and a second magnetic film of a CoCrPtB alloy that are serially formed over the first underlying film, wherein oxygen locally exists in an interface between the first underlying film and the second underlying film.