Patent ID: 7300715

Claim:
A magnetic recording medium comprising, in order: a non-magnetic substrate; a non-magnetic layer containing a non-magnetic powder which comprises carbon black having an average particle diameter of 10 nm to 100 nm, and a binder resin; and a magnetic layer containing a ferromagnetic metal powder and a binder resin, wherein the ferromagnetic metal powder has an average long axis length of 80 nm or less, a three-dimensional center surface average roughness of a surface of the magnetic layer in a region of 100 μm 2 based on a measurement with an atomic force microscope is 3.0 nm or less, and the area share held by asperities of at least ±5.0 nm with reference to the surface at an average height is 15 percent or less in a region of 100 μm 2 on the above described magnetic layer surface based on a measurement with an atomic force microscope.