Patent ID: 6989952

Claim:
A magnetic recording disk drive comprising: a magnetic recording disk comprising a substrate and a laminated magnetic recording layer on the substrate and having a lower ferromagnetic layer, an upper ferromagnetic layer and a nonferromagnetic spacer layer between the lower and upper ferromagnetic layers, at least one of the lower and upper ferromagnetic layers being an antiferromagnetically coupled (AFC) layer, the AfC layer comprising a first ferromagnetic film, a second ferromagnetic film and an antiferromagnetically coupling film located between the first and second ferromagnetic films and having a thickness and composition to provide antiferromagnetic exchange coupling of the first and second ferromagnetic films; an inductive write head for generating a magnetic field to alter the magnetization directions in regions of the lower and upper ferromagnetic layers, the magnetization directions of the lower and upper ferromagnetic layers in said regions being parallel; and a heater for directing heat to the region of the lower ferromagnetic layer exposed to the magnetic field from the write head.