SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND THESE MANUFACTURING METHODS

摘要

PROBLEM TO BE SOLVED: To provide a substrate for magnetic recording medium whose surface roughness is small and whose cost is low and a magnetic recording medium which includes the substrate for magnetic recording medium and these manufacturing methods.

SOLUTION: A substrate 10 for magnetic recording medium is configured to have a main substrate 12 whose one face is made a base face 12A and a sub-substrate 14 which is formed on the base face 12a of the main substrate 12 by a deposition method which impresses bias power such as bias sputtering on the main substrate 12 and and the surface roughness of the sub-substrate 14 is made smaller than that of the base face 12A of the main substrate 12.

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