Anomalous Hall Effect in Chemically Disordered L10-Mn1.5Ga

The anomalous Hall effect (AHE) in perpendicularly magnetized L10-Mn1.5Ga single-crystalline films is investigated as a function of degree of long-range chemical ordering and temperature. Our results provide firm evidence that phonons has negligibly smaller effect on skew scattering contributions to AHE resistivity than defects, the overlook of which in conventional scaling laws results in significant discrepancies and exponent n beyond 2 when fitting the data. We find that the broken of long-range chemical ordering strongly affects both intrinsic and extrinsic contributions of AHE conductivity, e.g., it greatly suppresses intrinsic contributions by influencing the topology of the band structures. Our results are of great importance for both physical understanding and technological engineering of the AHE.