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. 27, 2004
Filed:
Mar. 14, 2000
Applicant:
Inventor:
Ryoichi Mukai, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; C23C 1/400 ; C23C 1/434 ;
U.S. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; C23C 1/400 ; C23C 1/434 ;
Abstract
A magnetic recording medium comprising a non-magnetic base and a non-magnetic underlayer and a magnetic layer formed in that order on the base, the uniderlayer comprises a non-magnetic polycrystalline material and the magnetic layer comprises magnetic CoCr-based alloy particles, wherein the planar size of the magnetic alloy particles is defined by the planar size of the polycrystalline particles composing the underlayer, and is no greater than 20 nm. The magnetic recording medium is useful for HDDs in particular, having a very high magnetic coercive force and being capable of high recording density.