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Materials exhibiting controllable magnetic phase transitions are currently indemand for many spintronics applications. Here we investigate from firstprinciples the electronic structure and intrinsic anomalous Hall, spin Hall andanomalous Nernst response properties of the FeRh metallic alloy which undergoesa thermally driven antiferromagnetic-to-ferromagnetic phase transition. We showthat the energy band structures and underlying Berry curvatures have importantsignatures in the various Hall effects. Specifically, the suppression of theanomalous Hall and Nernst effects in the AFM state and a sign change in thespin Hall conductivity across the transition are found. It is suggested thatthe FeRh can be used a spin current detector capable of differentiating thespin Hall effect from other anomalous transverse effects. The implications ofthis material and its thermally driven phases as a spin current detectionscheme are also discussed.

Thermally driven anomalous Hall effect transitions in FeRh