Magnetoacoustics and magnon-polarons in surface acoustic wave resonators
ORAL · Invited
Abstract
Spin waves form the basis for the field of magnonics, where they are used for information transport and processing [1]. Acoustic waves, in particular surface acoustic waves (SAWs), are widely employed as frequency filters in mobile communication technology. In magnetic media, spin waves can interact with SAWs which defines the field of magnetoacoustics. Magnetoacoustic devices can be used to excite and detect magnetization dynamics acoustically and control SAW propagation magnetically. I will discuss the nonreciprocal properties of the magnetoacoustic interactions as well as the underlying coherent magnon-phonon transduction phenomena [2-4].
Magnons and phonons can hybridize to form magnon-polarons in surface magnetoacoustic wave resonators [5]. In our corresponding experiments, we use a hybrid structure consisting of low-loss yttrium iron garnet (YIG) magnetic films and ZnO-based lithographically defined SAW resonators. In our YIG/ZnO heterostructures, magnon-polarons form due to the strong coupling of standing SAWs and spin waves with magnon and phonon dissipation rates below 1.5 MHz [6]. We observe Rabi-like oscillations of the magnon-polarons in the time-domain. The hybridization is well described by phenomenological model calculations that account for the spatial profiles of both magnon and phonon modes.
[1] P. Pirro et al., Nat. Rev. Mater. 6, 1114 (2021)
[2] M. Weiler et al., Phys. Rev. Lett. 106, 117601 (2011)
[3] M. Küß, M. Albrecht, M. Weiler, Frontiers in Physics 10, 981257 (2022)
[4] Y. Kunz et al., Appl. Phys. Lett. 124, 152403 (2024)
[5] Y. Hwang et al., Phys. Rev. Lett. 132, 056704 (2024)
[6] K. Künstle et al., Nat. Commun. 16, 10116 (2025)
Magnons and phonons can hybridize to form magnon-polarons in surface magnetoacoustic wave resonators [5]. In our corresponding experiments, we use a hybrid structure consisting of low-loss yttrium iron garnet (YIG) magnetic films and ZnO-based lithographically defined SAW resonators. In our YIG/ZnO heterostructures, magnon-polarons form due to the strong coupling of standing SAWs and spin waves with magnon and phonon dissipation rates below 1.5 MHz [6]. We observe Rabi-like oscillations of the magnon-polarons in the time-domain. The hybridization is well described by phenomenological model calculations that account for the spatial profiles of both magnon and phonon modes.
[1] P. Pirro et al., Nat. Rev. Mater. 6, 1114 (2021)
[2] M. Weiler et al., Phys. Rev. Lett. 106, 117601 (2011)
[3] M. Küß, M. Albrecht, M. Weiler, Frontiers in Physics 10, 981257 (2022)
[4] Y. Kunz et al., Appl. Phys. Lett. 124, 152403 (2024)
[5] Y. Hwang et al., Phys. Rev. Lett. 132, 056704 (2024)
[6] K. Künstle et al., Nat. Commun. 16, 10116 (2025)
*This work was supported by the European Research Council (ERC) under the European Union's Horizon Europe research and innovation programme (Consolidator Grant "MAWiCS", Grant Agreement No. 101044526) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the Transregional Collaborative Research Center TRR 173/3-268565370 Spin+X.
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Publication: M. Weiler et al., Phys. Rev. Lett. 106, 117601 (2011)
M. Küß, M. Albrecht, M. Weiler, Frontiers in Physics 10, 981257 (2022)
Y. Kunz et al., Appl. Phys. Lett. 124, 152403 (2024)
K. Künstle et al., Nat. Commun. 16, 10116 (2025)
Presenters
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Mathias Weiler
- RPTU University Kaiserslautern-Landau