The observation of the magnon Hall effect (MHE) has relied solely on the challenging measurement of the thermal Hall conductivity. Here, we report a highly sensitive electrical Seebeck contrast method for the observation of MHE in ${\mathrm{Lu}}_2{\mathrm{V}}_2{\mathrm{O}}_7$/heavy metal heterostructures, which is highly desirable for the exploration of new MHE materials and their applications. Using measuring wires with very different Seebeck coefficients, we established a general method that can separate contributions (e.g., MHE) that generates a lateral temperature drop, from those [e.g., anomalous Nernst effect (ANE) and spin Seebeck effect (SSE)] that generate a lateral electric field. We show that a suitable heavy metal overlayer can eliminate the inherent ANE and SSE signals from the semiconducting ${\mathrm{Lu}}_2{\mathrm{V}}_2{\mathrm{O}}_7$. The MHE in ${\mathrm{Lu}}_2{\mathrm{V}}_2{\mathrm{O}}_7$ is quasi-isotropic among crystals with different orientations. In addition to the previously reported transverse MHE under an in-plane temperature gradient, we have uncovered longitudinal MHE under an out-of-plane temperature gradient.

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• Magnetism
• Magnons
• Spin caloritronics
• Thermal Hall effect
• Topological materials