Real-time observation of magnetization and magnon dynamics in a two-dimensional topological antiferromagnet MnBi2Te4

Luyi Yang

doi:10.1117/12.3000128

9 March 2024 Real-time observation of magnetization and magnon dynamics in a two-dimensional topological antiferromagnet MnBi₂Te₄

Luyi Yang

Author Affiliations +

Proceedings Volume PC12884, Ultrafast Phenomena and Nanophotonics XXVIII; PC1288402 (2024) https://doi.org/10.1117/12.3000128
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

In this work, we systematically investigate ultrafast magnetization dynamics and spin wave dynamics in few-layer topological antiferromagnetic MnBi2Te4 crystals as a function of layer number, temperature, and magnetic field. We find laser-induced (de)magnetization processes can be used to accurately track the distinct magnetic states in different magnetic field regimes, including showing clear odd-even layer number effects. In addition, strongly field-dependent antiferromagnetic magnon modes with tens of gigahertz frequencies are optically generated and directly observed in the time domain. Remarkably, we find that magnetization and magnon dynamics can be observed in not only the time-resolved magneto-optical Kerr effect but also the time resolved reflectivity, indicating strong correlation between the magnetic state and electronic structure. These measurements present the first comprehensive overview of ultrafast spin dynamics in this novel 2D antiferromagnet, paving the way for potential applications in 2D antiferromagnetic spintronics and magnonics as well as further studies of ultrafast control of both magnetization and topological quantum states.

Conference Presentation

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Luyi Yang "Real-time observation of magnetization and magnon dynamics in a two-dimensional topological antiferromagnet MnBi₂Te₄", Proc. SPIE PC12884, Ultrafast Phenomena and Nanophotonics XXVIII, PC1288402 (9 March 2024); https://doi.org/10.1117/12.3000128

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KEYWORDS

Magnons

Magnetism

Ultrafast phenomena

Quantum numbers

Ultrafast measurement systems

Quantum processes

Quantum regime

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