Patent ID: 6858330
Filing Date: 2005-02-22
Classification: G11B,Y10S

Abstract:
1. A perpendicular magnetic recording medium, comprising: a substrate; a soft magnetic underlayer formed on said substrate and containing ferromagnetic α-Fe nanocrystals; a nonmagnetic intermediate layer formed on said soft magnetic underlayer; and a perpendicular recording layer formed on said intermediate layer, wherein said soft magnetic underlayer contains Fe, Ta and C, and a concentration of said Ta ranges from 8 at % to 15 at % , and a nonmagnetic amorphous or nanocrystalline pre-coating layer is provided between said substrate and said soft magnetic underlayer, said pre-coating layer comprising at least one selected from the group consisting of NiZr alloy, NiTa alloy, NiNb alloy, NiTaZr alloy, NiNbZr alloy, CoCrZr alloy, NiCrZr alloy.