Perpendicular magnetic recording medium

A perpendicular magnetic recording medium, comprising:

• a soft magnetic under layer;
• an intermediate layer;
• a magnetic recording layer comprising a rare earth-transition metal alloy amorphous film and at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, B, Al, C and Si uniformly dispersed in the rare earth-transition metal alloy amorphous film;
• a protective layer;
• a liquid lubricant layer;
• and
• a nonmagnetic substrate, wherein the soft magnetic under layer, the intermediate layer, the magnetic recording layer, and the protective layer are built up in a predetermined order on the nonmagnetic substrate, wherein a concentration of the at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, B, Al, C and Si in the rare earth-transition metal alloy amorphous film is at least 1 atomic % but no more than 20 atomic %.

A perpendicular magnetic recording medium, comprising:

• a soft magnetic under layer;
• an intermediate layer;
• a magnetic recording layer comprising a rare earth-transition metal alloy amorphous film and at least one boride of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al or Si uniformly dispersed in the rare earth-transition metal alloy amorphous film;
• a protective layer;
• and
• a nonmagnetic substrate, wherein the soft magnetic under layer, the intermediate layer, the magnetic recording layer, and the protective layer are built up in a predetermined order on the nonmagnetic substrate.

A perpendicular magnetic recording medium, comprising:

• a soft magnetic under layer;
• an intermediate layer;
• a magnetic recording layer comprising a rare earth-transition metal alloy amorphous film and at least one carbide of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, B, Al or Si uniformly dispersed in the rare earth-transition metal alloy amorphous film;
• a protective layer;
• a liquid lubricant layer;
• and
• a nonmagnetic substrate, wherein the soft magnetic under layer, the intermediate layer, the magnetic recording layer, and the protective layer are built up in a predetermined order on the nonmagnetic substrate.