Here, we report the observation of strong coupling between magnons and surface acoustic wave (SAW) phonons in a thin CoFeB film constructed in an on-chip SAW resonator by analyzing SAW phonon dispersion anticrossings. Our device design provides the tunability of the film thickness with a fixed phonon wavelength, which is a departure from the conventional approach in strong magnon--phonon coupling research. We detect a monotonic increase in the coupling strength by expanding the film thickness, which agrees with our theoretical model. Our work offers a significant way to advance fundamental research and the development of devices based on magnon--phonon hybrid quasiparticles.
@article{arxiv.2309.12690,
title = {Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature},
author = {Yunyoung Hwang and Jorge Puebla and Kouta Kondou and Carlos Gonzalez-Ballestero and Hironari Isshiki and Carlos Sánchez Muñoz and Liyang Liao and Fa Chen and Wei Luo and Sadamichi Maekawa and Yoshichika Otani},
journal= {arXiv preprint arXiv:2309.12690},
year = {2023}
}
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Main text 6 pages, 4 figures, plus supplemental materials