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:
Nov. 21, 2006
Filed:
Apr. 28, 2004
Kiwamu Tanahashi, Kokubunji, JP;
Atsushi Kikugawa, Higashimurayama, JP;
Yukio Honda, Fuchu, JP;
Masaaki Futamoto, Shiroyama, JP;
Akira Ishikawa, Kokubunji, JP;
Kiwamu Tanahashi, Kokubunji, JP;
Atsushi Kikugawa, Higashimurayama, JP;
Yukio Honda, Fuchu, JP;
Masaaki Futamoto, Shiroyama, JP;
Akira Ishikawa, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A double layer perpendicular magnetic recording medium having a high medium S/N ratio at a recording density of 50 Gb/inor higher and a magnetic storage apparatus with a lower error rate and excellent reliability are provided. In a perpendicular magnetic recording medium in which a soft magnetic underlayer, an intermediate layer, and a perpendicular magnetic recording layerare sequentially formed on a substrate, the intermediate layeris made to be a non-magnetic amorphous alloy, in which Ni is a main component and Zr is contained, and the soft magnetic underlayeris constituted of ferromagnetic nan-crystals precipitated by annealing.