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:
Nov. 13, 2012
Filed:
Dec. 22, 2006
Kenji Shimizu, Chiba, JP;
Kenji Shimizu, Chiba, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
The present invention has its object to offer magnetic recording medium and magnetic recording and reproducing device that can record and reproduce high density data by optimizing the soft magnetic layer material forming the soft magnetic underlayer and the under layer material. In the present invention, the perpendicular magnetic recording medium A has at least the soft magnetic underlayer a, the under layer, the intermediate layerand the perpendicular magnetic recording layer on the non-magnetic substrate. The soft magnetic layersthat form the soft magnetic underlayer a, has an amorphous structure and is made of CoAl alloy or CoFeAl alloy having saturation magnetic flux density Bs greater than 1.1 T.