Patent ID: 8034472
Filing Date: 2011-10-11
Classification: B82Y,G11B,H01F

Abstract:
1. A magnetic recording medium comprising: at least an underlayer, an orientation control layer, a magnetic recording layer, and a protective layer formed on a non-magnetic substrate, wherein the orientation control layer has a multi-layer structure including at least a seed layer and an intermediate layer, the seed layer is arranged closer to the non-magnetic substrate than the intermediate layer, the seed layer includes an alloy layer that is made of a Cu—Ti alloy, which is a main material, having Cu as a main component, and in the Cu—Ti alloy, the content of Cu is in the range of 85 at % to 95 at %, and the content of Ti is in the range of 5 at % to 15 at %, the Cu—Ti alloy has a (111) crystal plane oriented substantially perpendicular to the surface of the non-magnetic substrate and has a pseudo-hexagonal structure, a film thickness of the seed layer is equal to or greater than 3 nm and equal to or less than 10 nm, the seed layer is formed directly on the soft magnetic underlayer, and the soft magnetic underlayer has a soft magnetic amorphous structure.