By combining the phenomena of voltage-controlled magnetic anisotropy (VCMA) and chiral resonant scattering of spin waves, we demonstrate through micromagnetic simulations that it is possible, by applying a dc voltage, to achieve tunable attenuation of spin waves propagating in an yttrium iron garnet (YIG) film. The resultant device, ...
By combining the phenomena of voltage-controlled magnetic anisotropy (VCMA) and chiral resonant scattering of spin waves, we demonstrate through micromagnetic simulations that it is possible, by applying a dc voltage, to achieve tunable attenuation of spin waves propagating in an yttrium iron garnet (YIG) film. The resultant device, dubbed as an electrical chiral magnonic resonator (ECMR), provides a solution for implementing the synapse function in a spin-wave-based neuromorphic computational system, which demands that the weight factor be continuously changeable. The voltage-based mechanism ensures the advantages of minimal energy consumption and physical compactness when compared with other tuning strategies, such as a local Oersted field generated by passing current through electrical leads. On the other hand, by applying a rf voltage, it is possible to utilize the same ECMR device design to achieve parametric amplification of spin waves in the same YIG film. This provides a viable solution to apply the concept of voltage-based parametric amplification to YIG materials. An analytical model is developed to describe the scattering characteristics of the ECMR amplifier, which enable fast computation in the case of magnonic circuitry design involving a large number of amplifier devices.
