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:
Oct. 26, 2004
Filed:
Aug. 22, 2002
Applicant:
Inventors:
Kiwamu Tanahashi, Kokubunji, JP;
Atsushi Kikugawa, Higashimurayama, JP;
Noboru Shimizu, Tokorozawa, JP;
Yukio Honda, Fuchu, JP;
Yuzuru Hosoe, Hino, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/667 ; G11B 5/738 ;
U.S. Cl.
CPC ...
G11B 5/667 ; G11B 5/738 ;
Abstract
There is provided a perpendicular magnetic recording medium comprising a non-magnetic layer having a face-centered cubic structure, an antiferromagnetic layer provided on the non-magnetic layer, a soft magnetic underlayer provided on the antiferromagnetic layer, and a perpendicular recording layer provided on the soft magnetic underlayer, which magnetic recording medium makes it possible to realize a recording density not less than 50 Gb/in and makes the error rate thereof low while suppressing the spike noise.