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The Righi-Leduc effect refers to the thermal analogue of the Hall effect, forwhich the electric current is replaced by the heat current and the electricfield by the temperature gradient. In both cases, the magnetic field generatesa transverse force that deviates the carriers (electron, phonon, magnon) in thedirection perpendicular to the current. In a ferromagnet, the magnetizationplays the role of the magnetic field, and the corresponding effect is calledanomalous Hall effect. Furthermore, a second transverse contribution due to theanisotropy, the planar Hall effect, is superimposed to the anomalous Halleffect. We report experimental evidence of the thermal counterpart of the Halleffects in ferromagnets, namely the magnon Hall effect (or equivalently theanomalous Righi-Leduc effect) and the planar Righi-Leduc effect, measured onferromagnets that are either electrical conductor (NiFe) or insulator (YIG).The study shows the universal character of these new thermokinetic effects,related to the intrinsic chirality of the anisotropic ferromagnetic degrees offreedom.

Magnon Hall effect and anisotropic thermal transport in NiFe and YIG ferromagnets