Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions

摘要

A magnetic recording medium is described, which comprises a support having thereon a substantially nonmagnetic lower layer and a magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder dispersed in a binder provided on the lower layer, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch2 of areal recording density, wherein the dry thickness of the magnetic layer is from 0.05 to 0.30 mum , phim is from 10.0x10-3 to 1.0x10-3 emu/cm2, the coercive force of the magnetic layer is 1,800 Oe or more, and a filler having an average particle size of from 0.05 to 0.3 mum is present on the surface layer of the support in an amount of from 5,000,000 to 30,000,000/mm2.