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. 03, 2012
Filed:
Nov. 02, 2006
Kenji Shimizu, Ichihara, JP;
Kenji Shimizu, Ichihara, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A magnetic recording medium A is provided on a non-magnetic substratewith at least a soft under layer α, an under film, an intermediate filmand a perpendicular magnetic recording film. The soft under layer a is a soft magnetic film having an amorphous structure. The under filmis formed of an Ni—W alloy. The intermediate filmis formed of an Ru alloy. In the Ni—W alloy, the Ni content is 80 atom % or more, and the W content is 20 atom % or less and preferably in the range of 1 atom % to 12 atom %. A magnetic recording and reproducing deviceequipped with the magnetic recording medium A is excellent in productivity and capable of recording and reproducing information of high density.