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:
Jan. 25, 2005
Filed:
Nov. 13, 2002
Tsuyoshi Onuma, Moriya, JP;
Akira Yano, Moriya, JP;
Satoshi Matsunuma, Kamakura, JP;
Takanobu Takayama, Toride, JP;
Tsuyoshi Onuma, Moriya, JP;
Akira Yano, Moriya, JP;
Satoshi Matsunuma, Kamakura, JP;
Takanobu Takayama, Toride, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magnetic recording mediumcomprises, on a substrate, a soft magnetic layer, a seed layer, and a recording layerhaving an artificial lattice structure. The seed layeris formed of Pd and one selected from the group consisting of Si, B, C, and Zr. Accordingly, the magnetic exchange coupling force of the recording layerin the in-plane direction can be weakened. Minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Thus, the medium noise is reduced. That is, reproduction can be performed with a low medium noise even when information is recorded at a high density. A magnetic storage apparatus, which is provided with the magnetic recording medium as described above, can achieve an areal recording density of 150 Gigabits/square inch.