Patent ID: 6939626

Claim:
A thin film magnetic recording medium for use with a magnetic recording head comprising: a layer stack on a substrate, said layer stack comprising; a first antiferromagnetically coupled magnetic layer structure having a; and first AFC-master ferromagnetic layer and a first AFC-slave; ferromagnetic layer that are antiferromagnetically coupled across a first spacer layer, the first AFC-master ferromagnetic layer having a first magnetic anisotropy; a second spacer layer adjacent to the first AFC-slave ferromagnetic layer; and a second antiferromagnetically coupled magnetic layer structure, disposed below the first antiferromagnetically coupled magnetic layer structure and the second spacer layer, having a second AFC-master ferromagnetic layer and a second AFC-slave ferromagnetic layer that are antiferromagnetically coupled across a third spacer layer, the second AFC-master ferromagnetic layer having a second magnetic anisotropy that is lower than the first magnetic anisotropy by an amount selected to compensate for a lower magnetic field from the magnetic recording head due to a larger distance between the magnetic recording head and the second AFC-master ferromagnetic layer, the second antiferromagnetically coupled magnetic layer structure being disposed so that the second spacer layer separates the second AFC-master ferromagnetic layer from the first AFC-slave ferromagnetic layer.