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. 30, 2001
Filed:
Aug. 31, 1995
Applicant:
Inventors:
Kazusuke Yamanaka, Kanagawa, JP;
Tomoo Yamamoto, Hchiohji, JP;
Yuzuru Hosoe, Hino, JP;
Nobuyuki Inaba, Hasuda, JP;
Yasutaro Uesaka, Kokubunji, JP;
Masaaki Futamoto, Kanagawa, JP;
Yoshibumi Matsuda, Odawara, JP;
Kenji Furusawa, Yokohama, JP;
Shinji Narishige, Kanagawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ;
U.S. Cl.
CPC ...
G11B 5/66 ;
Abstract
A ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25° C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.