Electrically Active Domain Wall Magnons in Layered van der Waals Antiferromagnets

TL;DR

This paper theoretically investigates domain wall magnons in layered van der Waals antiferromagnets, revealing their electrical activation via voltage-induced torques and tunability through magnetic fields, with implications for spintronics.

Contribution

It introduces the concept of electrically active domain wall magnons in layered vdW antiferromagnets and demonstrates their controllability for spintronic applications.

Findings

DW magnons can be activated by voltage-induced torques.

Electrical activation of DW magnons is tunable by magnetic fields.

Domain walls in vdW magnets can route coherent spin information.

Abstract

We study theoretically domain wall (DW) magnons-elementary collective excitations of magnetic DWs -- in easy-axis layered van der Waals (vdW) antiferromagnets, where they behave as normal modes of coupled spin superfluids. We uncover that, due to spin-charge coupling in vdW magnets, such DW magnons can be activated by voltage-induced torques, thereby providing a path for their low-dissipation and nanoscale excitation. Moreover, the electrical activation and the number of DW magnons at a frequency can be controlled by applying symmetry-breaking static magnetic field, adding tunability of signal transmission by them. Our results highlight that domain walls in vdW magnets provide a promising platform to route coherent spin information for a broad range of explorations in spintronics and magnetism.