Patent ID: 7746603

Claim:
A method for forming a magnetoresistive sensor, comprising: providing a first layer; and providing an antiparallel free layer formed on the first layer, wherein providing the antiparallel free layer comprises: providing a first free layer formed on the first layer; providing a first ferromagnetic coupling free layer formed on the first free layer, wherein the first ferromagnetic coupling layer is configured to provide increased coupling between the first free layer and an antiferromagnetic coupling layer; providing the antiferromagnetic coupling layer formed on the first ferromagnetic coupling free layer; providing a second ferromagnetic coupling free layer formed on the antiferromagnetic coupling layer; and providing a second free layer formed on the second ferromagnetic coupling free layer, wherein the second ferromagnetic coupling layer is configured to provide increased coupling between the second free layer and the antiferromagnetic coupling layer and a thickness of the second free layer is greater than a thickness of the first free layer.