Hiroyuki Arioka

Magnetic recording medium and recording/reproducing method thereof

A magnetic recording medium comprising a ferromagnetic metal thin film layer primarily based on cobalt and formed on the surface of a flexible substrate, and an organic topcoat layer containing a radiation curable compound having a molecular weight of less than 2,000, an anti-oxidant, and a lubricant on the surface of the metal thin film layer is provided with protrusions on its surface at an average density of at least 105 /a2 per square millimeter of the surface, the protrusions having a height of 30 to 300 Å where a is the distance of a gap in a magnetic head across which the medium is passed in recording/reproducing operation.