12.6.2025
Inducing surface acoustic waves nonreciprocity by magnetoelastic coupling
Dr. Roman Verba, Institute of Magnetism of National Academy of Sciences of Ukraine, Kyiv, Ukraine
Date, Time
12.06, 15:00 - 16:00
Nonreciprocity of wave propagation is a fascinating physical phenomenon, highly desirable and already widely used in microwave signal processing technique. Being dependent on the simultaneous breaking of time- and space-reversal symmetry, wave nonreciprocity is prohibited in the majority of simple physical systems. In particular, it is impossible to achieve nonreciprocal propagation of pure linear acoustic waves in solids, which constitutes a serious drawback of surface acoustic wave (SAW) based electronics, an overall nice technology for lightweight and compact microwave applications.
One of the most promising way of inducing of acoustic waves nonreciprocity is the utilization of magnetoelastic coupling with spin waves in hybrid piezoelectric-ferromagnetic heterostructures. This talk presents a review of various approaches for the magnetoelastic induction of acoustic wave nonreciprocity, starting from historically first approach based on the coupling chirality and covering recent theoretical ideas and experimental observations of giant, wide-band and phase nonreciprocity. Challenges and directions of further improvement are also discussed.