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:
Apr. 15, 2014
Filed:
Mar. 25, 2009
Teiichiro Umezawa, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
An object of the present invention is to increase an electromagnetic transducing characteristic (in particular, SNR) by further promoting separation and isolation of magnetic grains of a magnetic recording layer () in a perpendicular magnetic recording medium (). Thus, a typical structure of the perpendicular magnetic recording medium () according to the present invention includes, on a substrate (), at least a non-magnetic granular layer () having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between non-magnetic grains each continuously grown in a columnar shape and a magnetic recording layer () formed continuously with the non-magnetic granular layer () and having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between magnetic grains continuously grown in a columnar shape in this order, and at least one oxide included in the grain boundary part of the non-magnetic granular layer () and at least one oxide included in the grain boundary part of the magnetic recording layer () are oxides of a same composition.