Patent ID: 8623528

Claim:
A perpendicular magnetic recording medium comprising: a base; at least a magnetic recording layer, which is a ferromagnetic layer of a granular structure in which a non-magnetic grain boundary part is formed between crystal grains each grown in a columnar shape; a medium protective layer with carbon hydride as a main component in this order on said base; and a lower magnetic recording layer below the magnetic recording layer, wherein the grain boundary part of the magnetic recording layer contains SiO 2 and TiO 2 , the medium protective layer is formed in a state where the base having the magnetic recording layer formed thereon is heated at 160 to 200 degrees Celsius, the magnetic recording layer has a coercive force Hc equal to or larger than 5000 (Oe), the lower magnetic recording layer is a ferromagnetic layer of a granular structure in which a non-magnetic grain boundary part is formed between crystal grains each grown in a columnar shape, and the grain boundary part of the lower magnetic recording layer contains SiO 2 and CrO 2 .