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. 17, 2017
Filed:
Sep. 24, 2013
Applicant:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Inventor:
Takeshi Iwasaki, Inagi, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 5/73 (2006.01);
U.S. Cl.
CPC ...
G11B 5/7325 (2013.01); G11B 5/732 (2013.01); Y10T 428/1164 (2015.01);
Abstract
According to one embodiment, a perpendicular magnetic recording medium has an arrangement obtained by sequentially stacking a nonmagnetic substrate, a soft magnetic underlayer, a nonmagnetic seed layer containing silver grains having an fcc structure and an amorphous germanium grain boundary formed between the silver grains, a reaction barrier layer containing 90 at % or more of silver or aluminum and having a thickness of 2 nm or less, a nonmagnetic interlayer formed on the reaction barrier layer and made of ruthenium or a ruthenium alloy, and a perpendicular magnetic recording layer.