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:
Mar. 08, 2005
Filed:
Dec. 02, 2002
Tetsunori Koda, Moriya, JP;
Nobuyuki Inaba, Hasuda, JP;
Hideaki Yamanaka, Toride, JP;
Enji Fujita, Matsudo, JP;
Satoshi Matsunuma, Kamakura, JP;
Tetsunori Koda, Moriya, JP;
Nobuyuki Inaba, Hasuda, JP;
Hideaki Yamanaka, Toride, JP;
Enji Fujita, Matsudo, JP;
Satoshi Matsunuma, Kamakura, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magnetic recording mediumcomprises, on a substrate, a first orientation control layer, a second orientation control layer, a soft magnetic layer, a non-magnetic layer, a recording layer, and a carbon protective layer. The recording layeris formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePtordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePtordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer