Patent ID: 8792313
Filing Date: 2014-07-29
Classification: G11B

Abstract:
1. A magnetic recording medium comprising: an under layer formed on a substrate; and a magnetic layer, formed on the under layer, which contains an alloy having an L1 wherein the under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 Å≦a<3.04 Å, a second under layer having a BCC structure with a lattice constant a of 3.04 Å≦a<3.18 Å, a third under layer having a BCC structure with a lattice constant a of 3.18 Å≦a<3.31 Å, and an upper under layer having a NaCl-type crystal structure, the first under layer has a B2 structure, or has a BCC structure containing Cr as a main component, and information is recorded using a heat-assisted magnetic recording type or a microwave-assisted magnetic recording type.