A perpendicular magnetic recording medium including an interlayer
structure for crystallographically orienting a layer of a hexagonal
close-packed (hcp) perpendicular magnetic recording material formed
thereon, comprising in overlying sequence from a surface of a
magnetically soft underlayer: (1) a first crystalline layer of a
material having a first lattice parameter and a strong preferred growth
orientation; (2) a second crystalline layer of a material having a second
lattice parameter and the same strong preferred growth orientation as the
first crystalline layer; and (3) a third crystalline layer of an hcp
material, having a [0002] lattice parameter similar to or different from
that of the second lattice parameter of the second crystalline layer and
a strong <0002> preferred growth orientation, wherein: the second
crystalline layer has a lower interfacial energy with the first
crystalline layer and a higher interfacial energy with the third
crystalline layer, owing to a lower surface energy of the first
crystalline layer and a higher surface energy of the second crystalline
layer.