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. 11, 2007
Filed:
Sep. 04, 2003
Tetsuya Kanbe, Fujisawa, JP;
Tatsuya Hinoue, Fujisawa, JP;
Yotsuo Yahisa, Fujisawa, JP;
Hidekazu Kashiwase, Fujisawa, JP;
Hiroyuki Suzuki, Fujisawa, JP;
Tetsuya Kanbe, Fujisawa, JP;
Tatsuya Hinoue, Fujisawa, JP;
Yotsuo Yahisa, Fujisawa, JP;
Hidekazu Kashiwase, Fujisawa, JP;
Hiroyuki Suzuki, Fujisawa, JP;
Hitachi Global Storage Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetic recording apparatus including a drive unit to drive the magnetic recording medium, a compound-type magnetic head, a means to move the magnetic head relative to the magnetic recording medium, and a means to process recording and retrieving signals generated by the magnetic head. The magnetic recording medium comprises a non-magnetic substrate and a magnetic layer formed thereon with three underlayers interposed inbetween. The magnetic layer is composed of a plurality of layers of Co-based alloy of hexagonal close-packed structure which are antiferromagnetically coupled to one another through a non-magnetic intermediate layer, said three underlayers including an amorphous alloy layer, a Ta layer, and a Cr-based alloy layer of body-centered cubic structure.