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 $(1-5\mathrm{V}/\mu \mathrm{m})$ and selectively targets low magnon energies and perpendicular magnon modes. Laser fluence, damping, and photon loss tune the switching, advancing cavity-assisted optospintronics.

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• Antiferromagnetism
• Cavity quantum electrodynamics
• Demagnetization
• Dissipative dynamics
• Hybrid quantum systems
• Laser-induced demagnetization
• Light-matter interaction
• Magnetization switching
• Optical phonons
• Optical pumping
• Phonons
• Spin-phonon coupling
• Ultrafast demagnetization
• Lindblad equation
• Quantum spin chains