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:
Jan. 07, 2014
Filed:
Mar. 25, 2009
Teiichiro Umezawa, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
Tokichiro Sato, Singapore, SG;
Kenji Ayama, Singapore, SG;
Takahiro Onoue, Singapore, SG;
Junichi Horikawa, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Masafumi Ishiyama, Singapore, SG;
Tokichiro Sato, Singapore, SG;
Kenji Ayama, Singapore, SG;
Takahiro Onoue, Singapore, SG;
Junichi Horikawa, Singapore, SG;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
An object of the present invention is to provide a method of manufacturing a perpendicular magnetic recording medium () in which both of a coercive force Hc and reliability can be achieved at a higher level even with heating at the time of forming a medium protective layer () and to provide the perpendicular magnetic recording medium (). Thus, in a typical structure of the present invention, in the method of manufacturing the perpendicular magnetic recording medium () including at least a magnetic recording layer (), which is a ferromagnetic layer of a granular structure in which a non-magnetic grain boundary part is formed between crystal grains each grown in a columnar shape, and a medium protective layer () with carbon hydride as a main component in this order on a disk base (), the method includes a magnetic recording layer forming step of forming the magnetic recording layer () so that the grain boundary part contains oxides of a plurality of types and a medium protective layer forming step of forming the medium protective layer () in a state where the disk base () having the magnetic recording layer () formed thereon is heated at 160 to 200 degrees Celsius.