Atomic disorder and Berry phase driven anomalous Hall effect in a Co2FeAl Heusler compound

Co2-based Heusler compounds are the promising materials for the spintronics\napplication due to their high Curie temperature, large spin-polarization, large\nmagnetization density, and exotic transport properties. In the present\nmanuscript, we report the anomalous Hall effect (AHE) in a polycrystalline\nCo2FeAl Heusler compound using combined experimental and theoretical studies.\nThe Rietveld analysis of high-resolution synchrotron x-ray diffraction data\nreveals a large degree (~50 %) of antisite disorder between Fe and Al atoms.\nThe analysis of anomalous transport data provides the experimental anomalous\nHall conductivity (AHC) about 227 S/cm at 2 K with an intrinsic contribution of\n155 S/cm, which has nearly constant variation with temperature. The detailed\nscaling analysis of anomalous Hall resistivity suggests that the AHE in Co2FeAl\nis governed by the Berry phase driven intrinsic mechanism. Our theoretical\ncalculations reveal that the disorder present in Co2FeAl compound enhances the\nBerry curvature induced intrinsic AHC.\n