Patent ID: 7635498

Claim:
A fabrication method of a perpendicular magnetic recording medium, comprising: depositing a sequence of layers on a nonmagnetic substrate according to the following order: a soft magnetic under layer, an intermediate layer, a bilayer magnetic recording layer, a protective layer, and a liquid lubricant layer, wherein the bilayer magnetic recording layer comprises a first magnetic layer comprising a CoCr alloy crystalline film, and a second magnetic layer comprising a rare earth-transition metal alloy noncrystalline film, wherein the CoCr alloy crystalline film has a film thickness of 10 nm to 30 nm and the rare earth-transition metal alloy noncrystalline film has a film thickness of 2 nm to 15 nm, a thickness of the CoCr alloy crystalline film being at least twice a thickness of the rare earth-transition metal alloy noncrystalline film, and a gas pressure employed during the depositing of the rare earth-transition metal alloy noncrystalline film of the bilayer magnetic recording layer on the nonmagnetic substrate is 10 mTorr to 200 mTorr.