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. 25, 2005
Filed:
Feb. 03, 2003
Nobuyuki Inaba, Hasuda, JP;
Tetsunori Kouda, Moriya, JP;
Hideaki Yamanaka, Toride, JP;
Satoshi Matsunuma, Kamakura, JP;
Enji Fujita, Matsudo, JP;
Nobuyuki Inaba, Hasuda, JP;
Tetsunori Kouda, Moriya, JP;
Hideaki Yamanaka, Toride, JP;
Satoshi Matsunuma, Kamakura, JP;
Enji Fujita, Matsudo, JP;
Hitachi Maxell, Ltd., Ibaraki, JP;
Abstract
A magnetic recording medium comprises a magnetic recording layerwhich is formed by using an ordered alloy containing B on a substratecontaining an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layeris also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy. According to the present invention, it is possible to provide the magnetic recording medium for high density recording which is excellent in thermal stability and which involves low medium noise.