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. 11, 2011
Filed:
Nov. 20, 2008
Akira Sakawaki, Ichihara, JP;
Kenji Shimizu, Ichihara, JP;
Kazuo Kobayashi, Oyama, JP;
Hiroshi Sakai, Ichihara, JP;
Soichi Oikawa, Kawasaki, JP;
Takeshi Iwasaki, Kawasaki, JP;
Tomoyuki Maeda, Kawasaki, JP;
Futoshi Nakamura, Kawasaki, JP;
Akira Sakawaki, Ichihara, JP;
Kenji Shimizu, Ichihara, JP;
Kazuo Kobayashi, Oyama, JP;
Hiroshi Sakai, Ichihara, JP;
Soichi Oikawa, Kawasaki, JP;
Takeshi Iwasaki, Kawasaki, JP;
Tomoyuki Maeda, Kawasaki, JP;
Futoshi Nakamura, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A magnetic-recording medium which is provided on a nonmagnetic substrate with at least an orientation-controlling layer for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate, and a protective layer. The perpendicularly magnetic layer includes two or more magnetic layers, at least one of the magnetic layers is a layer having Co as a main component and containing Pt as well and containing an oxide, and at least another of the magnetic layers is a layer having Co as a main component and containing Cr as well and containing no oxide.