We investigate how spatiotemporal spin polarized current can lead to terahertz frequency excitations in non-collinear antiferromagnets. By solving the Landau-Lifshitz-Gilbert equation numerically for non-collinear antiferromagnet, we show that the magnon frequency spectrum exhibits standing spin wave modes and depends on the thickness of Mn3Ge in heterostructure Fe|Au|Mn3Ge. Also, we analyze the switching process of ground state as a function of a spin current. We show a switching phase diagram, which contains switching and non-switching regions. Our work suggests non-collinear antiferromagnets as an efficient platform for terahertz magnonics and ultrafast memory devices.
@article{arxiv.2501.01150,
title = {Terahertz Magnon Excitations and Switching in Non-Collinear Antiferromagnets},
author = {Durga Prasad Goli and Se Kwon Kim},
journal= {arXiv preprint arXiv:2501.01150},
year = {2025}
}