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:
Oct. 18, 2011
Filed:
Apr. 26, 2005
Miyabi Nakamura, Ibaragi, JP;
Takahiro Shimizu, Nagano, JP;
Hiroyuki Uwazumi, Nagano, JP;
Naoki Takizawa, Nagano, JP;
Tadaaki Oikawa, Nagano, JP;
Miyabi Nakamura, Ibaragi, JP;
Takahiro Shimizu, Nagano, JP;
Hiroyuki Uwazumi, Nagano, JP;
Naoki Takizawa, Nagano, JP;
Tadaaki Oikawa, Nagano, JP;
Abstract
A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.