Patent ID: 6808830
Filing Date: 2004-10-26
Classification: G11B,Y10S

Abstract:
A magnetic recording disk comprising a non-magnetic substrate, a non-magnetic undercoat layer, a magnetic layer, and a protective layer, the layers being formed on the substrate:wherein the non-magnetic undercoat layer has a bcc structure; an orientation-adjustment layer for causing the non-magnetic undercoat layer to have a predominant orientation plane of (200) is formed between the non-magnetic substrate and the non-magnetic undercoat layer; the magnetic layer has a crystal structure in which columnar crystal grains are inclined in a circumferential direction; and a ratio of a coercive force in a circumferential direction of the magnetic layer Hcc to a coercive force in a radial direction of the magnetic layer Hcr, i.e., Hcc/Hcr, is more than 1.