| US 7,611,783 B2 | ||
| Magnetic recording medium and magnetic recording device | ||
| Ryosaku Inamura, Kawasaki (Japan); Isatake Kaitsu, Kawasaki (Japan); and Takuya Uzumaki, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Mar. 14, 2006, as Appl. No. 11/374,424. | ||
| Application 11/374424 is a continuation in part of application No. 11/167579, filed on Jun. 28, 2005. | ||
| Claims priority of application No. 2005-104766 (JP), filed on Mar. 31, 2005; and application No. 2006-053288 (JP), filed on Feb. 28, 2006. | ||
| Prior Publication US 2006/0222901 A1, Oct. 05, 2006 | ||
| Int. Cl. G11B 5/66 (2006.01) | ||
| U.S. Cl. 428—827 [428/829; 428/831.2; 428/836.1] | 20 Claims |
| 1. A magnetic recording medium, comprising:
a base member;
an underlayer formed on the base member;
a main recording layer formed on the underlayer, the main recording layer having perpendicular magnetic anisotropy with an
anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1; and
a writing assist layer formed on or under the main recording layer in contact with the main recording layer, the writing assist
layer having an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2,
wherein the anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 and a2>a1.
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