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Experimental evidence consistent with a magnon Nernst effect in the antiferromagnetic insulator MnPS$$_3$$

Shiomi, Yuki*; Takashima, Rina*; Saito, Eiji

A magnon Nernst effect, an antiferromagnetic analog of the magnon Hall effect in ferromagnetic insulators, has been studied experimentally for the layered antiferromagnetic insulator MnPS$$_3$$ in contact with two Pt strips. Thermoelectric voltage in the Pt strips grown on MnPS$$_3$$ single crystals exhibits nonmonotonic temperature dependence at low temperatures, which is unlikely to be explained by electronic origins in Pt but can be ascribed to the inverse spin Hall voltage induced by a magnon Nernst effect. Control of antiferromagnetic domains in the MnPS$$_3$$ crystal by magnetoelectric cooling is found to modulate the low-temperature thermoelectric voltage in Pt, which is evidence consistent with the emergence of the magnon Nernst effect in Pt-MnPS$$_3$$ hybrid structures.

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Category:Materials Science, Multidisciplinary

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