Method of producing a perpendicular magnetic disc

Abstract

An object of the invention is to achieve thinning while maintaining a function required for an auxiliary recording layer, thereby achieving improvement of SNR. A configuration of a method for manufacturing a perpendicular magnetic disk 100 according to the invention includes a granular magnetic layer forming step, on a base 110, a granular magnetic layer 160 in which a grain boundary portion is formed by segregation of a non-magnetic substance containing an oxide as a main component around magnetic particles containing a CoCrPt alloy grown in a columnar shape as a main component; an auxiliary recording layer forming step of forming an auxiliary recording layer 180 that contains a CoCrPtRu alloy as a main component and has a film thickness of 1.5 to 4 nm above the granular magnetic layer; and a heating step of heating the base formed with the auxiliary recording layer in a temperature range of 210 to 250° C.

Dependencies are inferred from the claim text.