Patent ID: 7075760

Claim:
A magnetic head assembly, that has a head surface for facing a magnetic medium, comprising: a read head that includes a CPP sensor; the CPP sensor including: an antiparallel (AP) pinned layer structure; a ferromagnetic free layer having a magnetic moment that is free to rotate in response to a field signal; and a material spacer layer located between the free layer and the AP pinned layer structure; the antiparallel (AP) pinned layer structure including: ferromagnetic first and second antiparallel (AP) pinned layers; and an antiparallel (AP) coupling layer located between and interfacing the first and second AP pinned layers; an in-stack longitudinal biasing layer structure located within a track width of the sensor; the in-stack longitudinal biasing structure including: a ferromagnetic pinned layer having a magnetic moment; an antiferromagnetic (AFM) pinning layer exchange coupled to the ferromagnetic pinned layer for pinning the magnetic moment of the ferromagnetic pinned layer parallel to the head surface and parallel to major film planes of the layer of the sensor; and a ruthenium spacer layer located between the ferromagnetic pinned layer and the free layer; first and second leads connected to the sensor for conducting a current through the sensor perpendicular to major planes of the layers of the sensor.