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:
Feb. 17, 2004
Filed:
Feb. 16, 2001
Yoshibumi Matsuda, Odawara, JP;
Akira Ishikawa, Kodaira, JP;
Yotsuo Yahisa, Odawara, JP;
Yuzuru Hosoe, Hino, JP;
Tetsuya Kanbe, Yokohama, JP;
Koji Sakamoto, Odawara, JP;
Hitachi Global Storage Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetic recording medium having first undercoating layers ′ formed directly or via substrate face undercoating layers on a substrate , second undercoating layers ′ directly formed on the first undercoating layers ′, magnetic films ′ formed on the second undercoating layers ′, and protective films ′ formed on the magnetic films ′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.