Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.7: Poster

Donnerstag, 20. März 2025, 15:00–17:30, P3

Exploring spin-lattice coupling in the Van-der-Waals Antiferromagnet FePS3 — •David Gutnikov, Fabian Mertens, David Mönkebüscher, Richard Leven, Sophie Bork, Umut Parlak, and Mirko Cinchetti — Department of Physics, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany

Femtosecond laser pulses drive coherent ultrafast lattice dynamics and hybridized phonon-magnon interactions in the antiferromagnetic van der Waals semiconductor FePS₃. This study investigates the coupling between lattice vibrations and the magnetic system by examining the effects of excitation photon energy, sample temperature, and applied magnetic field on their dynamic interplay. Building on our previous findings [1], we conducted additional femtosecond white-light transient absorption measurements. In addition to the previously reported 3.2 THz coherent phonon mode — whose amplitude diminishes near the Néel temperature and vanishes in the paramagnetic phase — we confirmed its strong hybridization with a magnon under an external magnetic field, resulting in a coupled phonon-magnon mode that underscores the rich magneto-elastic interactions in this material. Beyond this, we identified a previously hidden phonon mode at 7.5 THz and shear oscillations around 20 GHz. These findings provide deeper insights into the spin-lattice coupling in FePS₃ and open new avenues for controlling THz magnonic dynamics in van der Waals antiferromagnets, with significant implications for advancing two-dimensional spintronic technologies.

[1] F. Mertens et al, Adv. Mater. 35, 2208355 (2023).

Keywords: Spin-lattice coupling; Coherent lattice dynamics; THz dynamics; Van-der-Waals semiconductor; Antiferromagnet