| 摘要 |
<p>[PROBLEMS] To provide a vertical magnetic recording disk, which has a film construction having improved overwriting properties (O/W) while maintaining a coercive force (Hc) maintained on such a level that does not affect thermal fluctuation resistance, and a method for manufacturing the same. [MEANS FOR SOLVING PROBLEMS] A magnetic disk for use in vertical magnetic recording, comprising a substrate and, provided on the substrate in the following order, at least a substrate layer, a first magnetic recording layer, and a second magnetic recording layer, characterized in that the first magnetic recording layer and the second magnetic recording layer are a ferromagnetic layer having a granular structure comprising a nonmagnetic material, which forms a grain boundary part among crystal grains containing at least Co (cobalt), and satisfy a requirement of A < B wherein A represents the content of a nonmagnetic material in the first magnetic recording layer, mol%; and B represents the content of the nonmagnetic material in the second magnetic recording layer, mol%.</p> |
