Patent ID: 8133601

Claim:
A perpendicular magnetic recording medium comprising at least an underlying layer, an orientation control layer, a magnetic recording layer, and a protective layer formed on a nonmagnetic substrate, wherein the orientation control layer includes two or more layers of a seed layer and an intermediate layer from the substrate side, the seed layer has an amorphous structure, and a contact angle of the intermediate layer material with respect to the seed layer material is in the range of 10 to 100 degrees, and the seed layer is formed of an alloy material containing Cr and Mn and the content of Cr is in the range of 30 at % to 70 at %, an alloy material containing Cr and Ti and the content of Cr is in the range of 30 at % to 75 at %, or an alloy material containing Cr and Fe and the content of Cr is in the range of 35 at % to 65 at %.