Substrate for magnetic recording medium, magnetic recording medium, and method of manufacturing the same

摘要

A substrate for a magnetic recording medium with a small surface roughness at a low cost, a magnetic recording medium including the substrate for the magnetic recording medium, and a method of manufacturing the same are provided. The substrate for a magnetic recording medium includes a main substrate one face of which serves as a base surface, and a sub-substrate formed on the base surface of the main substrate by a deposition technique such as a bias sputtering method which applies a bias power thereon. In this configuration, a surface roughness of the sub-substrate is smaller than a surface roughness of the base surface of the main substrate.