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:
Dec. 30, 2008
Filed:
Apr. 07, 2004
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;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A magnetic recording medium which is provided on a nonmagnetic substratewith at least an orientation-controlling layerfor controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layerhaving an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate, and a protective layerand characterized in that the perpendicularly magnetic layerincludes two or more magnetic layers, that at least one of the magnetic layers is a layerhaving Co as a main component and containing Pt as well and containing an oxide and that at least another of the magnetic layers is a layerhaving Co as a main component and containing Cr as well and containing no oxide.