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:
Sep. 30, 2003
Filed:
Jan. 28, 2002
Nobuyuki Inaba, Hasuda, JP;
Tomoo Yamamoto, Hachioji, JP;
Teruaki Takeuchi, Moriya, JP;
Masukazu Igarashi, Kawagoe, JP;
Yoshio Takahashi, Koganei, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic antisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant K at an absolute temperature of 300 K is greater than 3.6×10 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.