Doubly exchange-biased FeMn/NiFe/Cu/NiFe/CrMnPt spin valves

Doubly exchange-biased FeMn/NiFe/Cu/NiFe/ CrMnPt spin valves are prepared, By field annealing in magnetic fields of opposite directions, the magnetore sistive curve consists of two loops shifted in opposite directions from the zero magnetic field. Whether the NiFe layers are in the antiparallel state or in the parallel state in zero magnetic field can be adjusted by varying the exchange bias, By field annealing in magnetic fields of perpendicular directions, the total transverse bias field of the spin valve sensors is ne ar zero field. Therefore, the modified spin valve can maximize the linear r esponse region. It also shows potential for suppressing Barkhausen noise.