# Signature of magnon Nernst effect in an antiferromagnetic insulator

## TL;DR

This paper provides experimental evidence of the magnon Nernst effect in an antiferromagnetic insulator, MnPS3, demonstrating thermoelectric voltage modulation linked to antiferromagnetic domain control, advancing understanding of spin caloritronics.

## Contribution

First experimental demonstration of the magnon Nernst effect in an antiferromagnetic insulator, showing domain control influences thermoelectric signals in hybrid structures.

## Key findings

- Thermoelectric voltage exhibits non-monotonic temperature dependence.
- Voltage modulation correlates with antiferromagnetic domain control.
- Evidence supports the magnon Nernst effect as the underlying mechanism.

## Abstract

A magnon Nernst effect, an antiferromagnetic analogue of the magnon Hall effect in ferromagnetic insulators, has been studied experimentally for a layered antiferromagnetic insulator MnPS3 in contact with two Pt strips. Thermoelectric voltage in the Pt strips grown on MnPS3 single crystals exhibits non-monotonic temperature dependence at low temperatures, which cannot 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 MnPS3 crystal by magnetoelectric cooling is found to modulate the low-temperature thermoelectric voltage in Pt, which corroborates the emergence of the magnon Nernst effect in Pt|MnPS3 hybrid structures.