Harmonic and Subharmonic Magnon Generation in a Surface Acoustic Wave Resonator
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arXiv
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| Format: | Preprint |
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2025
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| author | Hwang, Yunyoung Liao, Liyang Puebla, Jorge Brühlmann, Marco Gonzalez-Ballestero, Carlos Kondou, Kouta Ogawa, Naoki Maekawa, Sadamichi Otani, Yoshichika |
| author_facet | Hwang, Yunyoung Liao, Liyang Puebla, Jorge Brühlmann, Marco Gonzalez-Ballestero, Carlos Kondou, Kouta Ogawa, Naoki Maekawa, Sadamichi Otani, Yoshichika |
| contents | We experimentally observe the generation of magnon harmonics and subharmonics in an on-chip surface acoustic wave resonator incorporating a thin Co$_{20}$Fe$_{60}$B$_{20}$ film, using micro-focused 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 fundamental magnetoelastic wave signal at $f_{1}$. Conversely, in the strong coupling regime, in addition to the fundamental magnetoelastic wave, we observe subharmonic and harmonic signals at $3/2f_{1}$, $2f_{1}$, and $3f_{1}$, 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 new route for magnonic signal processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19706 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Harmonic and Subharmonic Magnon Generation in a Surface Acoustic Wave Resonator Hwang, Yunyoung Liao, Liyang Puebla, Jorge Brühlmann, Marco Gonzalez-Ballestero, Carlos Kondou, Kouta Ogawa, Naoki Maekawa, Sadamichi Otani, Yoshichika Mesoscale and Nanoscale Physics Other Condensed Matter We experimentally observe the generation of magnon harmonics and subharmonics in an on-chip surface acoustic wave resonator incorporating a thin Co$_{20}$Fe$_{60}$B$_{20}$ film, using micro-focused 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 fundamental magnetoelastic wave signal at $f_{1}$. Conversely, in the strong coupling regime, in addition to the fundamental magnetoelastic wave, we observe subharmonic and harmonic signals at $3/2f_{1}$, $2f_{1}$, and $3f_{1}$, 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 new route for magnonic signal processing. |
| title | Harmonic and Subharmonic Magnon Generation in a Surface Acoustic Wave Resonator |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2509.19706 |