Keywords:Nernst effect, Heusler alloy, Topological magnet
Anomalous Nernst effect (ANE) can generate an electromotive force perpendicular to the heat flux, which provide a technological potential for film-based thermoelectric devices. However, the conversion efficiency was thought that be limited to around 1 μV/K, which is hundred times smaller than the Seebeck coefficient obtained in conventional thermoelectric materials because it is depended on their own magnetization. Recently, we found that the non-collinear Weyl anti-ferromagnet Mn3Sn and full-Heusler Weyl ferromagnet Co2MnGa show the large ANE 0.35 and 6 μV/K respectively due to a large Berry curvature from Weyl points working as a fictitious magnetic field in the momentum space. We fabricated the Weyl ferromagnet Co2MnGa thin films by DC magnetron sputtering and report ANE under in-plane and out-of-plane heat flux.