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arXiv · 2501.01150

Terahertz Magnon Excitations and Switching in Non-Collinear Antiferromagnets

Durga Prasad Goli·Se Kwon Kim
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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 Mn$_3$Ge in heterostructure Fe|Au|Mn$_3$Ge. 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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Durga Prasad Goli, Se Kwon Kim. 2025-01-02. Terahertz Magnon Excitations and Switching in Non-Collinear Antiferromagnets. https://arxiv.org/abs/2501.01150

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