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. 15, 2011
Filed:
Sep. 26, 2008
Kenji Ayama, Singapore, SG;
Tokichiro Sato, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
Junichi Horikawa, Singapore, SG;
Kenji Ayama, Singapore, SG;
Tokichiro Sato, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
Junichi Horikawa, Singapore, SG;
WD Media(Singapore) Pte. Ltd., Singapore, SG;
Abstract
The present invention provides a perpendicular magnetic recording medium that can reduce noise by further size reduction and isolation of magnetic grains in a magnetic recording layer and can increase the recording density by improvement of the SNR. A typical configuration of a perpendicular magnetic recording medium according to the present invention is a perpendicular magnetic recording medium having a magnetic recording layer with a granular structure in which non-magnetic grain boundary portions are formed between magnetic grains that have grown continuously in a columnar shape, wherein the grain boundary portions contain a plurality of kinds of oxides.