Patent ID: 6677051
Filing Date: 2004-01-13
Classification: G11B,Y10T

Abstract:
A magnetic recording medium comprising:a substrate; a magnetic layer disposed above said substrate, said magnetic layer having an initial layer on a first one of two sides closer to said substrate, and a final layer on a second one of the two sides directly on said initial layer and opposite to said substrate with respect to the initial layer, said initial layer being made of a CoCrB-based alloy having a B content of 1 at % or greater, said final layer being made of a Co-based alloy having a B content which is 0 or smaller than the B content of the initial layer; and a non-magnetic underlayer disposed between said substrate and said initial layer, wherein said final layer has small grain size and uniform grain size distribution nucleated by said initial layer, so that an average grain diameter of said final layer is smaller than an average grain diameter of said non-magnetic underlayer, and wherein said initial layer is non-magnetic at room temperature.