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. 10, 2013
Filed:
Jun. 29, 2005
Yoshiaki Sonobe, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Chikara Takasu, Tokyo, JP;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A magnetic diskfor use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate. The magnetic recording layer is composed of a ferromagnetic layerof a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layerhaving a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layerinterposed between the ferromagnetic layerand the stacked layer. After forming the ferromagnetic layeron the substrateby sputtering in an argon gas atmosphere, the stacked layeris formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer