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Bulk nanocrystalline materials of small and medium ferromagnetic content wereproduced using severe plastic deformation by high-pressure torsion atroomtemperature. Giant magnetoresistive behavior was found for as deformedmaterials, which was further improved by adjusting the microstructure withthermal treatments. The adequate range of annealing temperatures was assessedwith in-situ synchrotron diffraction measurements. Thermally treated CuComaterials show larger giant magnetoresistance after annealing for 1 h at 300C,while for CuFe this annealing temperature is too high and decreases themagnetoresistive properties. The improvement of magnetoresistivity by thermaltreatments is discussed with respect to the microstructural evolution asobserved by electron microscopy and ex situ synchrotron diffractionmeasurements.

Microstructural Changes Influencing the Magnetoresistive Behavior of Bulk Nanocrystalline Materials