We report on the experimental observation of excitation and detection of parametric spin waves and spin currents in the bulk acoustic wave resonator. The hybrid resonator consists of ZnO piezoelectric film, yttrium iron garnet (YIG) films on gallium gadolinium garnet substrate, and a heavy metal Pt layer. Shear bulk acoustic waves are electrically excited in the ZnO layer due to piezoeffect at the resonant frequencies of the resonator. The magnetoelastic interaction in the YIG film emerges magnons (spin waves) excitation by acoustic waves either on resonator's eigenfrequencies or the half-value frequencies at supercritical power. We investigate acoustic pumping of magnons at the half-value frequencies and acoustic spin pumping from parametric magnons, using the inverse spin Hall effect in the Pt layer. The constant electric voltage in the Pt layer, depending on the frequency, the magnetic field, and the pump power, was systematically studied. We explain the low threshold obtained (~0.4 mW) by the high efficiency of electric power transmission into the acoustic wave in the resonator.
@article{arxiv.2008.09520,
title = {Magnons Parametric Pumping in Bulk Acoustic Waves Resonator},
author = {S. G. Alekseev and S. E. Dizhur and N. I. Polzikova and V. A. Luzanov and A. O. Raevskiy and A. P. Orlov and V. A. Kotov and S. A. Nikitov},
journal= {arXiv preprint arXiv:2008.09520},
year = {2020}
}
Comments
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters Vol.117, Issue 7 and may be found at https://doi.org/10.1063/5.0022267