The phonon pumping effect has been studied theoretically and the frequency-dependent contribution to the magnetic damping is predicted. Here, we experimentally investigate the magnetic damping arising from phonon pumping in the ${\mathrm{LiNbO}}_3/{\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ heterostructures. The broadband ferromagnetic resonance and microwave absorption spectroscopy are employed to characterize the magnetization dynamics and magnetic damping. The magnetic damping exhibits nonlinear frequency dependence and thickness correlation. The microwave absorption spectroscopy results reveal a discrete signal profile, distinct from conventional continuous signals, which is correlated with the elastic waves propagating along in-plane directions.

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• Magnetic coupling
• Magnetization dynamics
• Magnetoacoustic effect
• Phonons
• Magnetic thin films
• Elastic wave theory
• Ferromagnetic resonance
• Landau-Lifschitz-Gilbert equation
• Spin wave spectroscopy
• Spin wave theory