Patent ID: 6830837
Filing Date: 2004-12-14
Classification: G11B,Y10S,Y10T

Abstract:
A longitudinal magnetic recording medium, comprising:a non-magnetic substrate; a plurality of underlayers formed on the non-magnetic substrate; and a magnetic layer formed on the non-magnetic substrate via the plurality of the underlayers, the magnetic layer comprising: a lower magnetic layer containing at least in an amount of not less than 3 at % to not more than 30 at %, and Cr in an amount greater than 0 at % to not more than 18 at %, and further containing at least one of B or C in an amount greater than 0 at % to not more than 20 at %, and the balance being made up of Co, and an upper magnetic layer containing Co as a main component, anti-ferromagnetically coupled with the lower magnetic layer via a non-magnetic intermediate layer.