Spin dynamics slowdown near the antiferromagnetic critical point in atomically thin FePS3

Abstract

Two-dimensional (2D) magnetic materials have attracted much recent interest with unique properties emerging at the few-layer limit. Beyond the reported impacts on the static magnetic properties, the effects of reducing the dimensionality on the magnetization dynamics are also of fundamental interest and importance for 2D device development. In this report, we investigate the spin dynamics in atomically-thin antiferromagnetic FePS3 of varying layer numbers using ultrafast pump-probe spectroscopy. Following the absorption of an optical pump pulse, the time evolution of the antiferromagnetic order parameter is probed by magnetic linear birefringence. We observe a strong divergence in the demagnetization time near the Néel temperature. The divergence can be characterized by a power-law dependence on the reduced temperature, with an exponent decreasing with sample thickness. We compare our results to expectations from critical slowing down and a two-temperature model involving spins and phonons, and discuss the possible relevance of spin-substrate phonon interactions.

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• Terahertz field-induced metastable magnetization near criticality in FePS3
• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
• Observation of giant surface second harmonic generation coupled to nematic orders in the van der Waals antiferromagnet FePS${}_3$
• Dynamical criticality of spin-shear coupling in van der Waals antiferromagnets
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• Coherent Spin-Phonon Coupling in the Layered Ferrimagnet Mn3Si2Te6