We experimentally observe the generation of magnon harmonics and subharmonics in an on-chip surface-acoustic-wave resonator incorporating a thin ${\mathrm{Co}}_{20}{\mathrm{Fe}}_{60}{\mathrm{B}}_{20}$ film using microfocused Brillouin light scattering. In our devices, rotating the in-plane magnetic field allows continuous tuning of the magnon-phonon coupling from weak to strong within the same resonator. In the weak-coupling regime, we only observe a fundamental magnetoelastic wave signal at $f_0$. Conversely, in the strong-coupling regime, in addition to the fundamental magnetoelastic wave, we observe subharmonic and harmonic signals at $(3/2)f_0$, $2f_0$, and $3f_0$, which are well reproduced by our analytical model. Our results establish phonons as a means to generate and control nonlinear magnons in the strong-coupling regime, providing a route for magnonic signal processing.

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• Magnetic coupling
• Magnetoacoustic effect
• Magnetoelastic effect
• Magnonics
• Magnons
• Phonons
• Quantum information with hybrid systems
• Spin waves