Patent ID: 6372325
Filing Date: 2002-04-16
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium comprising:a flexible nonmagnetic support; a nonmagnetic layer containing a nonmagnetic powder and a binder formed on the flexible nonmagnetic support; and a magnetic layer containing a ferromagnetic powder and a binder formed on the nonmagnetic layer, the magnetic layer having an average thickness d of 0.01 &mgr;m to 0.3 &mgr;m, a ratio &sgr;/d of a standard deviation &sgr; of the thickness of the magnetic layer to the average thickness d being 0.5 or less, and wherein a surface roughness spectrum, measured with an atomic force microscope, on the magnetic layer side of the flexible nonmagnetic support has a Power Spectrum Density of Roughness of 0.5 nm2 or less in a wavelength of 1 &mgr;m to 5 &mgr;m and a Power Spectrum Density of Roughness of 0.02 nm2 to 0.5 nm2 in a wavelength of 0.5 &mgr;m or more to less than 1 &mgr;m.