Patent ID: 6312785
Filing Date: 2001-11-06
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium comprising:a non-magnetic support member on which a magnetic layer constituted by a thin metal magnetic film is formed, the non-magnetic support member having at least two main surfaces,wherein at least either one of the at least two main surfaces of the non-magnetic support member has first projections, andwherein a main surface of the non-magnetic support member having the first projections formed thereon has a kurtosis (Ku) which is expressed by the following equation (1) and which is 10.0 to 50.0, ##EQU3##where f(x) is a roughness curve with respect to the central surface and Lx and Ly are lengths in the directions X and Y on the surface,average roughness Ra at the central surface of either main surface of the non-magnetic support member is 1.0 nm to 5.0 nm, andaverage roughness Rz of ten points on either main surface of the non-magnetic support member is 15 nm to 50 nm.