Enhanced mechanical damping induced by non-linear magnetization dynamics

Mechanical resonance properties of a microcantilever made of a magnetic insulator have been investigated by laser-doppler vibrometry under DC magnetic fields and microwaves. At ferromagnetic resonance conditions, reduction of magnetization along the DC field was detected as a change in the mechanical resonance frequency. Above a microwave power threshold at which the change in the mechanical resonance frequency deviates from the linear dependence on the power, the mechanical damping was found to be enhanced steeply. The result suggests that the non-linear magnetization dynamics gives rise to additional dissipation in the mechanical motion.