Fig. 4: Magnetization-dependence of the anomalous Nernst thermopower.

Comparison of the magnetization-dependent anomalous Nernst thermopower (|\(S_{yx}^A\)|) of various ferromagnetic metals (see Materials and methods for details), chiral antiferromagnet Mn₃Sn and Co₂MnGa extending the plot of Ikhlas et al.⁹. The shaded region indicates the linear relation for conventional ferromagnetic metals |\(S_{yx}^A\)| = |\(N_{yx}^A\)|µ₀M, with |\(N_{yx}^A\)| ranging from ∼0.05 µV K⁻¹ T⁻¹ to ∼1 µV K⁻¹ T⁻¹. The red dotted line indicates the upper limit of the measured value of |\(S_{yx}^A\)| in a conventional ferromagnet. The Nernst signal for Co₂MnGa falls out of the scope of this relation, similar to Mn₃Sn. The |\(S_{yx}^A\)| for Co₂MnGa shows the largest value reported among ferromagnetic metals at room temperature