Patent ID: 6815083
Filing Date: 2004-11-09
Classification: G11B,Y10T

Abstract:
A perpendicular magnetic recording medium having a substrate, a multi-layered magnetic film formed thereon with or without an underlying layer interposed therebetween, said multi-layered magnetic film being composed of an initial layer of Co alloy containing more than 30 at % of Cr or Cu and being formed on one side of the multi-layered magnetic film which faces the substrate, ferromagnetic metal layers containing Co and less than 20 at % of Cr, and non-magnetic metal layers containing mainly of Pd each of which is laminated alternately on top of one of the ferromagnetic metal layers, wherein a ratio of film thickness is defined by d1/d2 ranges from 1.5 to 4.0, d1 denotes a thickness of each of said ferromagnetic metal layers and d2 denotes a thickness of each of said non-magnetic metal layers and d2 ranges from 0nm to 2.0 nm.