Magnetic recording medium

摘要

A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer composed of ferromagnetic iron oxide powder dispersed in a binder, wherein a value of P10 of optical interference type three dimensional surface roughness on the magnetic layer side of the non-magnetic support is in the range of 15 to 35 nm, Rmax/P10 is not higher than 2.8 and P10 of the opposite side to the magnetic layer side is also in the range of 15 to 35 nm, wherein P10 (nm) represents the difference between an average height of the protrusions of 10 apices extracted in order of greatest height within an area 250 mu m square and an average height of all apices within the same 250 mu m square area and Rmax (nm) represents the difference between an uppermost height and a lowermost depth within the 250 mu m square area.