We propose a N\'eel magnetization switching mechanism in a hybrid magnon-phonon optical cavity system. A terahertz-pumped single-mode cavity photon couples to a spin-phonon chain, while the system dissipates energy via different baths. Our mean-field analysis reveals that the photon induces magnetization switching by generating strongly entangled magnon pairs with opposite momenta -- a feature weakly present in the cavity-free system. This switching occurs only at specific drive frequencies, namely at low magnon energies and near the upper edge (perpendicular modes) of the two-magnon band. Our results underscore the roles of laser fluence, damping, and photon loss in modulating the switching process, offering a promising route for cavity-assisted magnetization control in opto-spintronics.
@article{arxiv.2503.22882,
title = {Cavity-assisted magnetization switching in a quantum spin-phonon chain},
author = {Mohsen Yarmohammadi and Peter M. Oppeneer and James K. Freericks},
journal= {arXiv preprint arXiv:2503.22882},
year = {2025}
}