Terahertz Magnon Excitations and Switching in Non-Collinear Antiferromagnets

2025/01/02 by Durga Prasad Goli, Goli, Durga Prasad, Se Kwon Kim +1
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.2501.01150

openalex publication_date 2025/01/02 · openalex created_date 2025/01/04 · openalex updated_date 2026/07/28

Abstract

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.

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