Substrate for information recording media

摘要

A substrate for information recording media is disclosed which has optimized shapes of surface recesses and protrusions and thereby contributes to a reduction in flying height and causes neither head crushing nor thermal asperities.The substrate for information recording media has surface recesses and protrusions wherein the height thereof at a contact proportion for the recesses and protrusions of 0.4% is from 2 to 7 nm when the height of the recesses and protrusions at a contact proportion therefor of 50% is taken as a base. The contact proportion is a value based on the bearing ratio determined with an atomic force microscope.