PERFORMANCE OF YOKE TYPE GMR HEADS

Yoke type spin valve giant-magnetoresistive (GMR) heads with a track w idth of 70 and 10 mu m ale studied. The head design has the sensor on tap. The output of the heads is found to be upto 10 times larger than similar heads with a 30 nm Ni-Fe MRE linearized using a barberpole. Th e crucial role of the free layer permeability mu(r) and the ferromagne tic interlayer coupling with respect to the head performance is analys ed This is argued to give design rules for the GMR material. The appli ed FeMn exchange biasing is shown to become unreliable above T=105 deg rees C.