Patent ID: 6926977
Filing Date: 2005-08-09
Classification: G11B

Abstract:
1. A magnetic recording medium comprising a non-magnetic substrate, a non-magnetic undercoat layer, a plurality of magnetic layers, and a protective film, wherein at least one non-magnetic coupling layer is provided above the non-magnetic undercoat layer, a first magnetic layer is provided in contact with and beneath the non-magnetic coupling layer and a second magnetic layer is provided atop the non-magnetic coupling layer, and the first magnetic layer is formed of an alloy selected from the group consisting of a CoRu-based alloy containing 5 to 25 at % Ru, a CoRe-based alloy, a CoIr-based alloy, and a CoOs-based alloy, and wherein the alloy constituting the first magnetic layer has a lattice constant a of 0.25 nm to 0.26 nm and a lattice constant c of 0.407 nm to 0.422 nm.