Patent ID: 6590749
Filing Date: 2003-07-08
Classification: B82Y,G11B

Abstract:
A magnetic read head, which has an air bearing surface (ABS), comprising:a dual spin valve sensor including: antiferromagnetic first and second pinning layers; ferromagnetic first and second antiparallel (AP) pinned layer structures located between the first and second pinning layers with a first side of the first AP pinned layer structure interfacing the first pinning layer and a first side of the second AP pinned layer structure interfacing the second pinning layer so that the first AP pinned layer structure has a net magnetic moment oriented perpendicular to the air bearing surface and the second AP pinned layer structure has a net magnetic moment oriented antiparallel to the net magnetic moment of the first AP pinned layer structure; nonmagnetic electrically conductive first and second spacer layers located between the first and second AP pinned layer structures with a first side of the first spacer layer interfacing a second side of the first AP pinned layer structure and a first side of the second spacer layer interfacing a second side of the second AP pinned layer structure; a ferromagnetic free layer located between the first and second spacer layers with a first side of the free layer interfacing a second side of the first spacer layer and a second side of the free layer interfacing a second side of the second spacer layer; the net magnetic moment of the first AP pinned layer structure causing a demagnetizing field on the free layer which is oriented in a direction perpendicular to the air bearing surface and the net magnetic moment of the second AP pinned layer structure causing a demagnetizing field on the free layer which is oriented in a direction which is antiparallel to the demagnetizing field of the first AP pinned layer; and the first AP pinned layer structure exerting a ferromagnetic coupling field on the free layer which is oriented perpendicular to the air bearing surface and the second AP pinned layer structure exerting a ferromagnetic coupling field on the free layer which is oriented antiparallel to the ferromagnetic coupling field of the first AP pinned layer structure.