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:
Sep. 23, 2003
Filed:
Jun. 26, 2001
Applicant:
Inventors:
Tetsuya Kanbe, Odawara, JP;
Yotsuo Yahisa, Odawara, JP;
Yoshibumi Matsuda, Hiratsuka, JP;
Jo Inagaki, Odawara, JP;
Koji Sakamoto, Odawara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ; C25D 5/10 ; B32B 1/500 ;
U.S. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ; C25D 5/10 ; B32B 1/500 ;
Abstract
The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.