A dual current perpendicular to plane (CPP) sensor having an in stack bias
structure disposed between first and second free layers. The hard bias
structure includes a plurality of magnetic layers antiparallel coupled
with one another. At least one of the magnetic layers of the in stack
bias structure includes a layer of Ni sandwiched between first and second
layer of NiFe. The Ni provides a strong negative magnetostriction that
sets the moment of the magnetic layer in a desired direction parallel
with the ABS while the NiFe layers at either side of the Ni provide good
antiparallel coupling properties, allowing the magnetic layer to be
antiparallel coupled with adjacent magnetic layers of the in stack bias
structure.