Electrically Active Domain Wall Magnons in Layered van der Waals Antiferromagnets

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.

Automated summary

We theoretically study the domain wall (DW) magnons, which are elementary collective excitations of magnetic DWs, in easy-axis layered van der Waals (vdW) antiferromagnets and find that they behave as normal modes of coupled spin superfluids. Due to spin-charge coupling in vdW magnets, these DW magnons can be activated by voltage-induced torques, providing a low-dissipation and nanoscale excitation path. The electrical activation and the number of DW magnons at a frequency can be controlled by applying a symmetry-breaking static magnetic field, offering tunability of signal transmission. Our results demonstrate the potential of domain walls in vdW magnets for coherent spin information routing in spintronics and magnetism explorations.