Patent ID: 6430014
Filing Date: 2002-08-06
Classification: B82Y,G11B,Y10T

Abstract:
A magnetic read head comprising:a spin valve sensor including: an antiparallel (AP) pinned layer structure having a magnetic moment; an antiferromagnetic pinning layer exchange coupled to the AP pinned layer structure for pinning the magnetic moment in a predetermined pinned direction; a ferromagnetic free layer that has a magnetic moment that is free to rotate; a nonmagnetic conductive spacer layer located between the AP pinned layer structure and the free layer; a ferromagnetic biasing layer that has a magnetic moment which can be pinned antiparallel to the pinned direction of the AP pinned layer structure by a net sense current field on the biasing layer from conductive layers of the spin valve sensor; a nonmagnetic isolation layer located between the free layer and the biasing layer; the biasing layer being composed of CoFeNb or CoFeNbHf; the AP pinned layer structure exerting a net demagnetizing field HD and a ferromagnetic coupling field HF on the free layer, the conductive layers of the spin valve sensor exerting a net sense current field HI on the free layer and the biasing layer exerting a biasing field HB on the free layer; and HD+HI=HF+HB.