Magnetic dynamics of strained non-collinear antiferromagnet
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093902_1_5.0192467.pdf
Description
Published version
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1.18 MB
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f65b9cf9a6b42008319cb8c09582300c
Author(s)
He, Zhiping
Liu, Luqiao
Date Issued
March 1, 2024
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Citation
Zhiping He, Luqiao Liu; Magnetic dynamics of strained non-collinear antiferromagnet. J. Appl. Phys. 7 March 2024; 135 (9): 093902.
Version
Final published version
Abstract
In this work, we theoretically study the switching and oscillation dynamics in strained non-collinear antiferromagnet (AFM) Mn3X (X = Sn, Ge, etc.). Using the perturbation theory, we identify three separable dynamic modes—one uniform and two optical modes, for which we analytically derive the oscillation frequencies and effective damping. We also establish a compact, vector equation for describing the dynamics of the uniform mode, which is in analogy to the conventional Landau–Lifshitz–Gilbert (LLG) equation for ferromagnet but captures the unique features of the cluster octuple moment. Extending our model to include spatial inhomogeneity, we are able to describe the excitations of dissipative spin wave and spin superfluidity state in the non-collinear AFM. Furthermore, we carry out numerical simulations based on coupled LLG equations to verify the analytical results, where good agreements are reached. Our treatment with the perturbative approach provides a systematic tool for studying the dynamics of non-collinear AFM and is generalizable to other magnetic systems in which the Hamiltonian can be expressed in a hierarchy of energy scales.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1063/5.0192467
