| US 7,592,080 B2 | ||
| Perpendicular magnetic recording medium | ||
| Shunji Takenoiri, Nagano (Japan); and Yasushi Sakai, Nagano (Japan) | ||
| Assigned to Fuji Electric Device Technology Co., Ltd., Tokyo (Japan) | ||
| Filed on Oct. 09, 2007, as Appl. No. 11/907,118. | ||
| Claims priority of application No. 2006-278580 (JP), filed on Oct. 12, 2006; and application No. 2007-143473 (JP), filed on May 30, 2007. | ||
| Prior Publication US 2008/0096055 A1, Apr. 24, 2008 | ||
| Int. Cl. G11B 5/66 (2006.01) | ||
| U.S. Cl. 428—828.1 [428/831] | 16 Claims |
| 1. A perpendicular magnetic recording medium, comprising:
a nonmagnetic substrate;
a first underlayer provided on the nonmagnetic substrate;
a first nonmagnetic intermediate layer provided on the first underlayer;
a second underlayer provided on the first nonmagnetic intermediate layer;
a second nonmagnetic intermediate layer provided on the second underlayer; and
a magnetic recording layer provided on the second nonmagnetic intermediate layer,
wherein the first underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes
at least Ni and Fe, and
wherein the second underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes
at least Co.
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