Patent ID: 6963461

Claim:
A method for recording in a disk drive having an inductive write head and a magnetic recording disk, the method comprising: providing a magnetic recording disk with a laminated layer having a lower ferromagnetic layer, an upper ferromagnetic layer and a nonferromagnetic spacer layer between the lower and upper ferromagnetic layers, the magnetizations of the lower and upper ferromagnetic layers being parallel in a first direction in a region of the laminated layer; directing a magnetic field from the write head to said region of the laminated layer, the strength of said field at the middle of the upper ferromagnetic layer being greater than the intrinsic coercivity of the upper ferromagnetic layer, whereby the magnetization direction in the upper ferromagnetic layer is reversed by said field, and the strength of said field at the middle of the lower ferromagnetic layer being less than the intrinsic coercivity of the lower ferromagnetic layer; and heating the lower ferromagnetic layer in the presence of the magnetic field to lower its intrinsic coercivity to thereby enable reversal of the magnetization direction in the lower ferromagnetic layer by said field, whereby the magnetizations of the lower and upper ferromagnetic layers are parallel in a second direction opposite said first direction in said region.