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:
Nov. 04, 2014
Filed:
Dec. 07, 2009
Chiyo Saito, Tokyo, JP;
Tokichiro Sato, Singapore, SG;
Takenori Kajiwara, Tokyo, JP;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
Provided are a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch; and a method for manufacturing the same. The magnetic disk according to the present invention comprises: a granular magnetic recording layer () which is formed on a disk substratedirectly or via an intermediate layer and which has non-magnetic regions between granular columnar particles; and an auxiliary recording layer () which is formed on the granular magnetic recording layerand which causes exchange interaction among the granular columnar particles, wherein the auxiliary recording layer () contains 0.1 to 3 moles of oxygen.