Patent ID: 7474514

Claim:
A magnetoresistive head comprising: on a substrate, an anti-ferromagnetic layer, a pinned layer in which a direction of magnetization is fixed by exchange coupling with the anti-ferromagnetic layer, a free layer, a non-magnetic spacer layer formed between the pinned layer and the free layer, and a protective layer; wherein the anti-ferromagnetic layer is disposed between the substrate and the free layer, the anti-ferromagnetic layer comprises MnPt, the free layer comprises CoFe, the pinned layer has a first ferromagnetic layer and a second ferromagnetic layer anti-ferromagnetically coupled to each other by way of an anti-ferromagnetic coupling layer, the composition of the first ferromagnetic layer disposed between the anti-ferromagnetic coupling layer and the anti-ferromagnetic layer is within a range of about: Co 100-X Fe X (at %) 20<X≦50, and a magnetoresistance ratio is about 13.3 (%) or more.