Voltage-induced topological transitions of spin waves in multiferroic structures
Andrey A. Grachev,1, Maxim A. Gorlach, 2, Evgeniy N. Beginin, 1, Alexandr V. Sadovnikov, 1
1Laboratory "Magnetic Metamaterials", Saratov State University, Saratov 410012, Russia
2School of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
Abstract
Here, we report the experimental realization of magnonic crystal hosting topological states of spin waves, whose existence and localization is controlled by the externally applied voltage. Such electric tunability is achieved by controlling the distribution of internal magnetic fields in the structure which have the direct effect on the order of magnonic bands as well as the width of the respective gap. Our structure thus realizes electrically tunable topological insulator for spin waves. The study will experimentally and numerically demonstrate the possibility of tuning the frequency band in the spectrum of spin waves due to distributed elastic deformations occurring at the interface between a magnonic crystal and a piezolayer.
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Andrey Grachev
Saratov state University
Russia
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