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arXiv · 2309.12690

Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature

Yunyoung Hwang·Jorge Puebla·Kouta Kondou·Carlos Gonzalez-Ballestero·Hironari Isshiki·Carlos Sánchez Muñoz·Liyang Liao·Fa Chen·Wei Luo·Sadamichi Maekawa·Yoshichika Otani
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Abstract

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.

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Yunyoung Hwang, Jorge Puebla, Kouta Kondou, Carlos Gonzalez-Ballestero, Hironari Isshiki, Carlos Sánchez Muñoz, Liyang Liao, Fa Chen, Wei Luo, Sadamichi Maekawa, Yoshichika Otani. 2023-09-22. Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature. https://arxiv.org/abs/2309.12690

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