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8 March 2024 Chiral phonon-induced magnetization in cerium fluorides
Jiaming Luo, Tong Lin, Junjie Zhang, Xiaotong Chen, Elizabeth R. Blackert, Rui Xu, Boris I. Yakobson, Hanyu Zhu
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Proceedings Volume 12884, Ultrafast Phenomena and Nanophotonics XXVIII; 1288404 (2024) https://doi.org/10.1117/12.2692426
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
Controlling time-reversal symmetry on very short time scales may enable novel non-equilibrium phases of matter with broken, as well as ultrafast spintronics for energy-efficient information processing. Strongly driven phonons directly influence the interatomic distances, orbital symmetry, and exchange interactions that are closely related to magnetism in materials. Chiral phonons, where atoms rotation unidirectionally around the equilibrium position inside crystalline lattice, break time reversal symmetry and are expected to directly couple with magnetization. We excited chiral phonons using circular-polarized terahertz pulses and observed a prominent transient magneto-optic Kerr effect in cerium trifluoride, which was known to have unusually large spin-phonon coupling. The effective magnetic field needed to polarize the paramagnetic spins is on the order of 1 tesla under very moderate absorbed fluence of 0.2 mJ/cm2. The temperature dependence of the spin dynamics indicates the magnetic field indeed is generated by the phonons, as opposed to a pure electromagnetic inverse Faraday effect. Our result may open a new route to investigate spin-phonon interaction in ultrafast magnetism.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Jiaming Luo, Tong Lin, Junjie Zhang, Xiaotong Chen, Elizabeth R. Blackert, Rui Xu, Boris I. Yakobson, and Hanyu Zhu "Chiral phonon-induced magnetization in cerium fluorides", Proc. SPIE 12884, Ultrafast Phenomena and Nanophotonics XXVIII, 1288404 (8 March 2024); https://doi.org/10.1117/12.2692426
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KEYWORDS
Phonons
Magnetism
Terahertz radiation
Cerium
Fluoride
Angular momentum
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