A current-perpendicular-to-the-plane (CPP) magnetoresistive sensor has
additional layers for stabilizing the free layer against
sense-current-generated magnetic fields. A ferromagnetic stabilizing
layer is spaced from the free layer by a spacer layer and is exchange
coupled with a second antiferromagnetic layer, the first
antiferromagnetic layer being the conventional one for pinning the pinned
layer in the CPP sensor. The stabilizing layer is in a vortex or other
non-longitudinal magnetization pattern that is fixed by exchange coupling
with the second antiferromagnetic layer. The stabilizing layer is also
ferromagnetically coupled to the free layer across the spacer layer so
that in the absence of both a sense current and an external magnetic
field, the free and stabilization layers have similarly shaped vortex or
other non-longitudinal magnetization patterns. The sense current
generates a vortex magnetic field in the free layer opposite to the fixed
vortex magnetization pattern in the stabilizing layer and essentially
erases the effect of the vortex magnetization pattern in the free layer.