Understanding spin waves in 2D magnets: A combined experimental, computational, and mathematical theory approach

Link: https://rdcu.be/ezDAO

Abstract: We present our work towards developing a comprehensive approach to understanding spin-wave (SW) dispersion in 2D van der Waals (vdW) magnets, combining steady-state and time-resolved spectroscopy with electronic structure calculations and mathematical modeling of SW propagation. Exploiting magnon–exciton coupling in CrSBr, we utilize time-resolved reflectance to detect a novel regime of optically generated resonances at 77 and 87 GHz and investigate their origin with magnetic field dependence. We use density functional theory (DFT) calculations of magnetic exchange couplings to model the impact of strain on coupling parameters in CrSBr and present a theoretical framework to determine dispersion characteristics based on quantum field theory (QFT), an alternate to the Landau–Lifshitz equation (LL) approach predominantly used in the literature. Our combined approach allows for the incorporation of additional parameters that more accurately describe the properties of the material into SW models.

Recommended citation: Aislinn, P.J., Winchell, A.J., Lambertson, E.R. et al. Understanding spin waves in 2D magnets: A combined experimental, computational, and mathematical theory approach. MRS Advances (2025).
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