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. 28, 2014
Filed:
Sep. 16, 2009
Takahiro Onoue, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Toshiaki Tachibana, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
Takahiro Onoue, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Toshiaki Tachibana, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A perpendicular magnetic recording medium with SNR improved by reducing noise due to an auxiliary recording layer so that a higher recording density can be achieved. The perpendicular magnetic recording mediumincludes a base, at least a magnetic recording layerhaving a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape; a non-magnetic split layerdisposed on the magnetic recording layerand containing Ru and oxygen; and an auxiliary recording layerthat is disposed on the split layerand that is magnetically approximately continuous in an in-plane direction of a main surface of the base