Cavity-assisted magnetization switching in a quantum spin-phonon chain
ORAL
Abstract
We propose a mechanism for Néel switching via suppressed heating in a hybrid magnon-phonon cavity. A terahertz-driven cavity mode couples to a spin-phonon chain, and all particles dissipate energy through baths. Mean-field analysis shows that cavity photons enable switching by imbalancing the spin-density on sublattices—a symmetry-breaking effect absent without the cavity. Switching occurs at low fields (1−5V/μm) and selectively targets low magnon energies and perpendicular magnon modes. Laser fluence, damping, and photon loss tune the switching, advancing cavity-assisted optospintronics.
*M.Y. acknowledges the hospitality of Uppsala University during his visit. M.Y. and J.K.F. were supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-FG02-08ER46542 for the formal developments, the numerical work, and the writing of the manuscript. J.K.F. was also supported by the McDevitt bequest at Georgetown. P.M.O. acknowledges support by the Swedish Research Council (VR), the German Research Foundation (Deutsche Forschungsgemeinschaft) through CRC/TRR 227 Ultrafast Spin Dynamics (Project MF, Project-ID: 328545488), and the K. and A. Wallenberg Foundation (Grants No. 2022.0079 and No. 2023.0336).
