摘要 |
A perpendicular magnetic recording medium has a magnetic recording layer with ferromagnetic crystalline grains and nonmagnetic and nonmetallic grain boundary region surrounding the grains. The surface of its underlayer, before forming the magnetic recording layer, is exposed to an O<SUB>2 </SUB>or N<SUB>2 </SUB>atmosphere or an atmosphere of rare gas and O<SUB>2 </SUB>or N<SUB>2</SUB>, to attach the O<SUB>2 </SUB>or N<SUB>2 </SUB>as nucleation sites for promoting growth of the nonmagnetic and nonmetallic region. By forming the magnetic recording layer thereafter, both ferromagnetic crystalline grains and the nonmagnetic and nonmetallic grain boundary region are formed from the initial stage of the growth of the magnetic recording layer. Thus, a magnetic recording layer having excellent segregation structure can be formed.
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