Substrate for perpendicular magnetic recording medium, perpendicular magnetic recording medium using the substrate, and method of manufacturing

摘要

A substrate for a perpendicular magnetic recording medium provides an increase in the recording density of a magnetic layer of the substrate without increasing the recorded track width, with the skew angle of the magnetic pole of a magnetic recording head varied. The surface of the substrate is grooved in concentric circles to provide a land and a groove alternated with each of the land and the groove arranged at regular intervals. The total of land width and groove width is equal to the track pitch of a magnetic recording head used in magnetic recording. The land widths are less than or equal to the effective recorded track width of the magnetic recording head, and the grooves have depths 200 nm or more.