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:
Jun. 26, 2018
Filed:
May. 16, 2017
Showa Denko K.k., Tokyo, JP;
Takayuki Fukushima, Chiba, JP;
Yuji Murakami, Chiba, JP;
Tetsuya Kanbe, Chiba, JP;
Lei Zhang, Chiba, JP;
Kazuya Niwa, Chiba, JP;
Hisato Shibata, Chiba, JP;
SHOWA DENKO K.K., Tokyo, JP;
Abstract
A magnetic recording medium includes a substrate; a lower base layer formed on the substrate; and a (001) oriented L1magnetic layer formed on the lower base layer and including a first magnetic layer formed on the lower base layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing C, and a second magnetic layer formed on the first magnetic layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing oxide or nitride, the second magnetic layer further containing one or more elements selected from a group consisting of Mg, Ni, Zn, Ge, Pd, Sn, Ag, Re, Au and Pb as an additive.