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:
Oct. 21, 2014
Filed:
Mar. 15, 2011
Tokichiro Sato, Singapore, SG;
Takenori Kajiwara, Singapore, SG;
Tokichiro Sato, Singapore, SG;
Takenori Kajiwara, Singapore, SG;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A perpendicular magnetic disk that includes, on a base, a soft magnetic layer, an amorphous alloy layer, a preliminary ground layer provided on the amorphous alloy layer, a ground layer formed of Ru or a Ru-type alloy having an hcp crystal structure provided on the preliminary ground layer. A granular magnetic layer is provided on the ground layer. The amorphous alloy layer contains Ta, and the preliminary ground layer includes a first preliminary ground layer formed of Ti or a Ti alloy of microcrystals and a second preliminary ground layer formed of a Ni-type alloy of an fcc crystal structure.