Patent ID: 8617727

Claim:
A perpendicular magnetic recording medium comprising: a non-magnetic substrate; and a soft magnetic underlayer, a seed layer, a first non-magnetic intermediate layer, a second non-magnetic intermediate layer, a granular magnetic recording layer, an exchange coupling force control layer, a non-granular magnetic recording layer, a protective layer, and a lubricant layer that are sequentially formed on the non-magnetic substrate, wherein the seed layer is made of a material that includes NiFeCrMo and at least one of Co, Si, and Ti, and has an fcc structure, the first non-magnetic intermediate layer is made of an alloy including CoCrMo or CoCrMoRu, and the second non-magnetic intermediate layer is made of an alloy including Ru or RuW, wherein the second non-magnetic intermediate layer is formed directly on the first non-magnetic intermediate layer made of an alloy.