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It is shown that the maximum stable output of a CPP-GMR sensor is increasedsignificantly by using a synthetic ferrimagnet free layer, provided theelectron current flows from free layer to reference layer. This free layerallows a larger magnetoresistance ratio for a given free layer magnetic moment,and in addition results in a greater than three-fold increase in the criticalcurrent above which spin-torque instability of the free layer occurs. In readheads with net free layer moments equivalent to only 4.5nm of Ni80Fe20, thiseffect is shown to result in sustainable sense current densities above 2e8A/cm2.

High-output CPP-GMR sensor with synthetic-ferrimagnet free layer and enhanced spin-torque critical currents