Patent ID: 9224413
Filing Date: 2015-12-29
Classification: G11B

Abstract:
1. A magnetic recording medium manufacturing method comprising: forming a magnetic recording layer on a substrate; forming a mask layer on the magnetic recording layer; forming projecting patterns on the mask layer; transferring the projecting patterns to the mask layer; etching the magnetic recording layer through the mask layer having the projecting patterns; and removing the mask layer, the etching performed under a condition which meets an expression (1) below to form the magnetic recording layer including a plurality of projections having a shape combining a circular truncated conical shape as a vertex region, and a truncated polygonal conical shape as a bottom region: wherein X (nm) is a diameter of the projecting patterns of the mask layer, Y (nm) is an etching depth of the magnetic recording layer, Z (nm) is a dot pitch of the projecting patterns of the mask layer, and θ is a taper angle of a side surface of the projection with respect to a bottom surface thereof.