Patent ID: 8084149

Claim:
A thermally assisted magnetic recording medium, comprising a layered film structure formed of an under layer made of a high K F ferromagnetic substance satisfying T W <T C , an intermediate layer with K AF satisfying T B <T W , and an upper layer used as a recording and reproducing layer made of a ferromagnetic substance or ferrimagnetic substance satisfying T W <T C , where T W is a recording temperature, T C is a Curie point, T B is a blocking temperature, K F is a ferromagnetic magnetocrystalline anisotropy constant, and K AF is an antiferromagnetic magnetocrystalline anisotropy constant, wherein K F of the under layer is larger than K AF of the intermediate antiferromagnetic layer, wherein the intermediate layer is selected from a group consisting of γ-MnIr, γ-MnRh, γ-MnRu, γ-MnNi, γ-MnPt, γ-MnPd, γ-Mn(PtRh) or γ-Mn(RuRh), wherein the under layer and the upper layer have different compositions.