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:
Jul. 07, 2015
Filed:
Aug. 12, 2013
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Tomonori Katano, Matsumoto, JP;
Akiyasu Kumagai, Matsumoto, JP;
Katsumi Taniguchi, Matsumoto, JP;
Hiromi Ono, Matsumoto, JP;
Narumi Sato, Matsumoto, JP;
Shinji Uchida, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A magnetic recording medium includes a substrate having sequentially formed thereon (a) a magnetic layer; (b) a protective layer having a thickness ranging from 1.0 nm to 2.5 nm and being composed of an amorphous metal layer having a thickness of at least 0.3 nm, the amorphous metal layer being composed of a metal selected from the group consisting of Si, Al, Ge, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W that is in an amorphous state; (c) a carbon layer formed on the amorphous metal layer and having a thickness of at least 0.3 nm, the carbon layer including amorphous carbon; and (d) a lubricating layer, wherein the carbon layer includes nitrogen atoms in a surface thereof in which a ratio of number of nitrogen atoms to total number of carbon atoms, nitrogen atoms, and oxygen atoms is 14 atomic % or less.