PERPENDICULAR MAGNETIC RECORDING MEDIUM

摘要

According to one embodiment, a perpendicular magnetic recording medium is provided, which includes a non-magnetic granular underlayer formed on a substrate and containing metal grains of a first metal and a grain boundary layer surrounding the metal grains, each metal grain including a projection projecting from the boundary layer and a bottom portion embedded in the grain boundary layer, and a contact angle of the edge of the projection to the surface of the grain boundary layer being 45° to 85°, a non-magnetic intermediate layer formed on a surface of each projection and a magnetic recording layer having a projection pattern formed on the basis of a pattern of the projections in the non-magnetic intermediate layer via the non-magnetic intermediate layer.

主权项

1. A perpendicular magnetic recording medium comprising:
a substrate; a non-magnetic granular underlayer formed on the substrate and comprising a plurality of metal grains and a grain boundary layer configured to surround the plurality of metal grains, each of the plurality of metal grains comprising a projecting portion projecting from the boundary layer and a bottom portion embedded in the grain boundary layer, and a contact angle made between a surface of the grain boundary layer and a tangential line on an edge of the projecting portion being 45° to 85°; a non-magnetic intermediate layer formed on a surface of each projecting portion; and a perpendicular magnetic recording layer comprising magnetic crystal grains formed on the non-magnetic intermediate layer and a grain boundary region configured to surround the magnetic crystal grains.