Patent ID: 6472048
Filing Date: 2002-10-29
Classification: G11B,Y10T

Abstract:
A magnetic recording medium comprising:a substrate; and a maghemite thin film formed on said substrate, said maghemite thin film having a thickness of 10 to 50 nm, and a surface roughness represented by a center line average roughness (Ra) of 0.1 to 0.7 nm and a maximum height (Rmax) of 1 to 10 nm wherein said magnetic recording medium is produced by a process comprising: (a) forming a magnetite thin film on a substrate; (b) subjecting said magnetite thin film to plasma treatment at a substrate temperature of 100 to 200Â° C. using an oxygen gas or an oxygen-containing mixed gas; and (c) oxidizing said magnetite thin film to transform the magnetite thin film into a Maghemite thin film.