Patent ID: 8404130

Claim:
A method of manufacturing a discrete track medium type perpendicular magnetic recording medium comprising: laminating at least a magnetic recording layer, a sacrifice layer, and a carbon protective layer on a nonmagnetic substrate in this order; using a mask of a resist film pattern formed in a concentric pattern to form protruding parts for constructing recording tracks and recessed parts; selectively removing the carbon protective layer to expose the sacrifice layer and the magnetic recording layer in the recessed parts, modifying the sacrifice layer and the magnetic recording layer exposed at the recessed parts into a nonmagnetic state; removing the resist film, the carbon protective layer, and the sacrifice layer from the protruding parts; and depositing a carbon protective layer and a lubricant layer in this order on the recessed parts and the protruding parts, wherein the magnetic recording layer is a composite magnetic recording layer including an upper magnetic recording layer, a coupling layer, and a lower magnetic recording layer, the composite magnetic recording layer further including a middle magnetic recording layer between the upper magnetic recording layer and the coupling layer, wherein a uniaxial magnetic anisotropy constant Ku1 of the lower magnetic recording layer, a uniaxial magnetic anisotropy constant Ku2 of the middle magnetic recording layer, and a uniaxial magnetic anisotropy constant Ku3 of the upper magnetic recording layer are different from each other and satisfies a relation between their magnitudes Ku1>Ku2>Ku3.