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Here, we report the observation of strong coupling between magnons andsurface acoustic wave (SAW) phonons in a thin CoFeB film constructed in anon-chip SAW resonator by analyzing SAW phonon dispersion anticrossings. Ourdevice design provides the tunability of the film thickness with a fixed phononwavelength, which is a departure from the conventional approach in strongmagnon--phonon coupling research. We detect a monotonic increase in thecoupling strength by expanding the film thickness, which agrees with ourtheoretical model. Our work offers a significant way to advance fundamentalresearch and the development of devices based on magnon--phonon hybridquasiparticles.

Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature