Abstract
The conditions for the parametric instability of magnons under the action of purely elastic pumping, which are modes of a composite acoustic wave resonator containing ferrimagnet and piezoelectric films on a single-crystal substrate, are considered. Electrical excitation of bulk acoustic waves occurs due to the piezoelectric effect (in a ZnO film) at resonant frequencies fn of the resonator. In a magnetically ordered layer (in a film of yttrium iron garnet), acoustic modes, when the threshold power is exceeded, excite magnons at frequencies fn/2. It is shown that, in the case of pumping by transverse acoustic modes, the threshold is several tens of times smaller than in the case of pumping by longitudinal modes and is approximately 100 μW, which is in agreement with experimental data.
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This study was carried out a state assignment and with partial financial support from the Russian Foundation for Basic Research (project no. 20-07-01075).
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Polzikova, N.I., Alekseev, S.G. & Raevskii, A. Parametric Pumping of Magnons in a Hybrid Magnon–Phonon Resonator. J. Commun. Technol. Electron. 66, 1296–1301 (2021). https://doi.org/10.1134/S1064226921110061
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DOI: https://doi.org/10.1134/S1064226921110061