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. 02, 2015
Filed:
Jul. 25, 2012
Tomonori Katano, Matsumoto, JP;
Akiyasu Kumagai, Matsumoto, JP;
Katsumi Taniguchi, Matsumoto, JP;
Hiromi Ono, Matsumoto, JP;
Narumi Sato, Matsumoto, JP;
Tomonori Katano, Matsumoto, JP;
Akiyasu Kumagai, Matsumoto, JP;
Katsumi Taniguchi, Matsumoto, JP;
Hiromi Ono, Matsumoto, JP;
Narumi Sato, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., , JP;
Abstract
A recording medium for recording and reproducing information by means of a head which performs information readout and writing based on magnetic principles is disclosed. The medium comprises a magnetic layer formed on a substrate and a protective layer formed on the magnetic layer. The protective layer comprises an underlayer formed on the magnetic layer and includes a material selected from the group consisting of silicon, silicon carbide and germanium. A carbon layer formed on the underlayer includes amorphous carbon containing hydrogen. The amount of hydrogen in the carbon layer is 24.7 at % or higher and 46.8 at % or lower, the thickness of the underlayer is 0.3 nm or greater and 1.8 nm or less, and the thickness of the carbon layer is 0.2 nm or greater and 1.7 nm or less. The medium exhibits corrosion resistance, sliding durability and head flying characteristics, and reduces magnetic spacing while securing reliability.