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. 02, 2007
Filed:
Jan. 18, 2005
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;
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;
Hitachi Global Storage Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.