PREVENTING METHOD FOR STRIPPING OF ALUMITE OF MAGNETIC DISC SUBSTRATE

摘要

PURPOSE:To prevent stripping of an alumite layer of a magnetic disc substrate from Al base in the stage of forming a magnetic film on an alumite substrate by sputtering by heating the alumite substrate at specific temp. CONSTITUTION:In the case of forming a magnetic film of gamma-Fe2O3, etc. on an alumite substrate by sputtering to about 0.2mum thickness, the alumite substrate is beforehand heated for about 1hr at 150-350 deg.C, after which it is slowly cooled at 100 deg.C/hr cooling rate. By such heat treatment, the strains between the alumite layer and the Al are relieved, and the stripping of the aluminte layer from the underlying Al at the temp. in the stage of forming the magnetic film by sputtering is prevented.