Abstract:
The design of a unidirectional magnonic coupler in the form of YIG (yttrium iron garnet) waveguides with lateral coupling covered with a metal layer is proposed. The studied structure features unidirectional coupling that may be controlled by the external magnetic field direction, which was verified numerically and experimentally. The process of propagation of a spin-wave signal in it is associated with strong nonreciprocity, which manifests itself as changes in the amplitude-frequency response observed when the external magnetic field direction is varied. It is also demonstrated how the dynamic magnetization profile of a spin wave changes when the direction of propagation is reversed. The obtained results illustrate the feasibility of fabrication of nonreciprocal magnonic devices, such as multichannel magnonic couplers, multiplexers, and logic devices based on them, from a metallized structure.
Keywords:magnonics, planar systems, unidirectionality, magnetic field, multilayer systems.
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