Patent ID: 8758911
Filing Date: 2014-06-24
Classification: G11B

Abstract:
1. A perpendicular magnetic recording medium comprising, over a substrate, a main recording layer having a granular structure in which magnetic grains are grown in a columnar shape, a continuous layer magnetically continuous in an in-plane direction, and a reinforcing layer, wherein the main recording layer, the reinforcing layer, and the continuous layer are formed in this order over the substrate and wherein: the reinforcing layer has a granular structure and a saturation magnetization Ms of the reinforcing layer is at least 200 emu/cc higher than a saturation magnetization Ms of the main recording layer and at least 200 emu/cc higher than a saturation magnetization of the continuous layer; the reinforcing layer is any one of Co—TiO the reinforcing layer has a thickness of 2 nm or less.