| abstract |
A perpendicular magnetic memory medium capable of high-density recording and reproducing consists of a soft magnetic lining layer ( 12 ), a non-magnetic middle layer ( 13 ), a recording layer ( 14 ) that is formed by arranging hard magnetic nanoparticles ( 17 ), an overcoat layer ( 15 ), and a lubricous layer ( 16 ), all of which are arranged on a substrate ( 11 ) in this sequence, wherein an average diameter of the nanoparticles ranges between 2 nm and 10 nm, a standard deviation of diameters of the nanoparticles is 10% or less of the average diameter of the nanoparticles, and an average interval of the nanoparticles is between 0.2 nm and 5 nm, and an magnetic easy axis of the recording layer 14 is perpendicular to a face of the substrate ( 11 ), such that high-density recording and reproducing is realized by the perpendicular magnetic medium. |