Magnetic recording medium allowing head suspension distance to be reduced for hard disc scanning

摘要

A magnetic recording medium consists of a magnetic layer, possibly with an underlayer on a non-magnetic substrate which, under irradiation from an energy beam forms protrusions of a height between 1 and 60 nm at a density of from 10 squared to 10 to the power of 8 per square mm on the surface. The useful dimensions are of height in the region 10 to 60 nm, at a density of 10 cubed to 10 to the power of 8 per square mm. A recess area may also be formed between protrusions by suitable use of the energy beam.