| US 7,510,789 B2 | ||
| Perpendicular magnetic recording media | ||
| Yoshiyuki Hirayama, Kokubunji (Japan); Hiroyuki Nakagawa, Yokohama (Japan); Hiroaki Nemoto, Olso (Japan); Ichiro Tamai, Hachioji (Japan); and Ikuko Takekuma, Odawara (Japan) | ||
| Assigned to Hitachi Global Storage Technologies Japan, Ltd., Kanagawa-ken (Japan) | ||
| Filed on Jun. 09, 2005, as Appl. No. 11/148,164. | ||
| Application 11/148164 is a continuation of application No. 10/372335, filed on Feb. 25, 2003, granted, now 6,916,557. | ||
| Claims priority of application No. 2002-244473 (JP), filed on Aug. 26, 2002; and application No. 2003-006507 (JP), filed on Jan. 15, 2003. | ||
| Prior Publication US 2005/0227121 A1, Oct. 13, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G11B 5/66 (2006.01) | ||
| U.S. Cl. 428—831.2 | 5 Claims |
| 1. A perpendicular magnetic recording medium having a perpendicular magnetization film on a nonmagnetic substrate via a soft
magnetic film and an intermediate film,
said intermediate film formed of a plurality of layers between said soft magnetic film and said perpendicular magnetization
film, and
said intermediate film including at least two layers, said at least two layers including:
an oxygen-containing layer, or a nonmetallic element-containing layer containing one of nitrogen, silicon and carbon; and
a metallic layer formed on a surface side of said oxygen-containing layer or said nonmetallic element-containing layer, said
metallic layer including a plurality of isolated island-shaped structures separated from one another, wherein
the surface of said oxygen-containing layer or said nonmetallic element-containing layer as an underlining layer of said metallic
layer is exposed at a surrounding of each of said isolated island-shaped structures, and crystal grains of said perpendicular
magnetization film are formed in separated groups each corresponding to one of said isolated island-shaped structures.
|