Patent ID: 7972716

Claim:
A perpendicular magnetic recording medium comprising: a soft magnetic underlayer, a first seed layer, a second seed layer, an intermediate layer, a granular magnetic recording layer, a non-granular magnetic recording layer, a protective layer, and a lubricant layer laminated on a nonmagnetic substrate in this order, the first seed layer containing cobalt, nickel, and at least one element selected from a group consisting of Si, Cr, V, Zr, Nb, Ta, Ti, Cu, and Mo, and the second seed layer containing nickel, chromium, and at least one element selected from a group consisting of Si, V, Zr, Nb, Ta, Ti, Cu, and Mo, wherein a misfit between crystal lattice planes perpendicular to the substrate of the second seed layer and of the intermediate layer is in a range of +5.3% to +6.8%.