Patent ID: 6924048
Filing Date: 2005-08-02
Classification: G11B,Y10S

Abstract:
1. A magnetic device comprising: a magnetic recording disk; and a magnetic head, wherein the magnetic recording disk has a substrate, an underlayer which is a monolayer or multiple layer which is formed on the substrate and a magnetic layer which is formed on the underlayer, said magnetic layer has a granular structure in which magnetic crystal grains disperse in nonmagnetic phase; a length of the magnetic crystal grain in a perpendicular direction to the magnetic layer is smaller than a thickness of the magnetic layer, a C-axis of the magnetic grain is randomly oriented in the granular structure, a ratio of Hcc to Hcr is in the range of 1.0≦Hcc/Hcr≦3.0., where Hcc is the coercive force measured in the circumferential direction of the magnetic recording medium and Hcr is the coercive force measured in the radial direction of the magnetic recording medium; and an area ratio of the crystal grain whose major axis direction is within 30° from a circumferential direction is 45% or more, wherein a shape of the crystal grain of the magnetic layer is approximately an elliptical shape.