Patent ID: 6818331
Filing Date: 2004-11-16
Classification: G11B,Y10S

Abstract:
A magnetic recording medium comprising, in order, a non-magnetic substrate; an orientation-regulating layer for regulating the crystal orientation of a layer provided directly thereon; a perpendicular magnetic layer in which easy-magnetization axes are oriented generally perpendicular to the substrate; and a protective layer;and wherein the perpendicular magnetic layer is formed from a material containing Co as a primary component and at least Cr, Pt, and Nd, a ratio of residual magnetization (Mr) in a direction perpendicular to the substrate to saturation magnetization (Ms) in a direction perpendicular to the substrate is at least 0.85, and an activation magnetic moment represented by the product of activation volume and saturation magnetic moment is 0.3Ã—10âˆ’15 emu to 0.8Ã—10âˆ’15 emu.