Large enhancement of the spin Hall effect in Mn metal by Sn doping

Abstract

The noncollinear kagome lattice antiferromagnets Mn${}_{3}X$ ($X$=Sn, Ge, Ga) have attracted much attention due to their large anomalous Hall effect (AHE). As the spin Hall effect (SHE) and AHE share the same origin, the injection of pure spin current into these alloys would also engender large SHE. The authors surprisingly find that even a Mn-Sn amorphous/nanocrystalline alloy exhibits large SHE. These results not only serve as an essential reference in studying the pure spin current phenomena in Mn-based alloys but also offer a promising method in exploring energy efficient spin Hall materials.