Patent ID: 8771849
Filing Date: 2014-07-08
Classification: G11B

Abstract:
1. A perpendicular magnetic recording medium comprising: a substrate; an intermediate layer; a seed layer of a face-centered cubic structure positioned on a substrate side of the intermediate layer, the seed layer comprising a first layer of an alloy including Ni as its main component and materials selected from Ta and W at 10 at % or less in total, a Cu layer positioned below the first layer, and a Ti layer positioned below the Cu layer; a magnetic recording layer; and a protecting layer, said substrate layer, said intermediate layer, and said magnetic recording layer formed above the substrate, wherein: the intermediate layer comprises a mixture of a first material and a second material, the first material is a non-magnetic alloy comprising Co and Cr as its main components, the second material is an oxide, and the average content ratio of an oxygen element in the intermediate layer is in the range from 10 at % to 20 at %, and a grain diameter of crystal grains of the intermediate layer and a grain diameter of crystal grains of the magnetic recording layer are both in a range from 5 nm to 15 nm.