Patent ID: 6280813
Filing Date: 2001-08-28
Classification: C23C,G11B

Abstract:
A magnetic recording medium comprising:a substrate;a magnetic recording layer on the substrate and comprising a first ferromagnetic film having a magnetic moment per unit area, a nonferromagnetic spacer film on the first ferromagnetic film, and a second ferromagnetic film having a magnetic moment per unit area different from the moment per unit area of the first ferromagnetic film and being formed on the spacer film, the second ferromagnetic film being exchange coupled antiferromagnetically to the first ferromagnetic film across the spacer film, the magnetic recording layer exhibiting a major hysteresis loop with two remanent magnetic states in the absence of an applied magnetic field; andwherein the orientations of the moments of the first and second ferromagnetic films are substantially antiparallel in each remanent state, but the first ferromagnetic film's moment orientation in one remanent state is substantially antiparallel to its orientation in the other remanent state.