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:
Mar. 31, 2009
Filed:
Jun. 09, 2005
Yoshiyuki Hirayama, Kokubunji, JP;
Hiroyuki Nakagawa, Yokohama, JP;
Hiroaki Nemoto, Olso, JP;
Ichiro Tamai, Hachioji, JP;
Ikuko Takekuma, Odawara, JP;
Yoshiyuki Hirayama, Kokubunji, JP;
Hiroyuki Nakagawa, Yokohama, JP;
Hiroaki Nemoto, Olso, JP;
Ichiro Tamai, Hachioji, JP;
Ikuko Takekuma, Odawara, JP;
Hitachi Global Storage Technologies Japan, Ltd., Kanagawa-ken, JP;
Abstract
A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.