Flux guide read head with in stack biased current perpendicular to the planes (CPP) sensor

摘要

Various embodiments of a read head employ a bias stack which is in a sensor stack of the read head. The bias stack includes a biasing layer and is separated from a free layer in the sensor by a spacer layer. A magnetic moment of the free layer is longitudinally biased antiparallel to a magnetic moment of the biasing layer because of the coupling therebetween. The free layer is therefore more uniformly longitudinally biased than when hard bias layers are employed at first and second side surfaces of the sensor. Various methods are described for making the various read heads of the present invention.