Patent ID: 7089648

Claim:
Method for fabricating a magnetoresistive head comprising: making a magnetoresistive element having a first ferromagnetic layer, a second magnetic layer, a nonmagnetic conductive layer or a nonmagnetic tunneling barrier layer formed between said first ferromagnetic layer and said second ferromagnetic layer, a first antiferromagnetic layer formed on the first ferromagnetic layer opposite to the nonmagnetic conductive layer or a nonmagnetic tunneling barrier layer, and a second antiferromagnetic layer formed on the second ferromagnetic layer opposite to the nonmagnetic conductive layer or a nonmagnetic tunneling barrier layer, wherein a blocking temperature T B1 of the first antiferromagnetic layer is higher than a blocking temperature T B2 of the second antiferromagnetic layer, providing unidirectional magnetic anisotropy to the first ferromagnetic layer by the first antiferromagnetic layer, by heating higher than T B2′ and applying a magnetic field enough to saturate a magnetization direction of the first ferromagnetic layer in the element height direction, providing unidirectional magnetic anisotropy to the second ferromagnetic layer by the second antiferromagnetic layer, by heating lower than T B1′ and applying a magnetic field enough to saturate a magnetization direction of the second ferromagnetic layer in the track width.