Three-terminal magnonic demultiplexer, power divider, and circulator

Abstract

Spin waves, the collective precession of spins in ordered magnets, have attractive properties and have aroused extensive investigation of using them as data carriers. Lots of signal processing devices based on spin waves have been investigated recently, in which one structure normally realized a single function. Here, we propose and numerically demonstrate a conceptual prototype of one three-terminal magnonic device with three functions: demultiplexer, power divider, and circulator. These magnonic functions in “tuning fork” shaped magnetic waveguide are realized by the interfacial Dzyaloshinsky-Moriya interaction induced chiral spin wave modes of the circular cavity, which results in the difference between the intensity and phase of propagating magnetostatic forward volume spin waves. For the demultiplexer, the dual-frequency spin waves can be effectively separated from the fork handle into the two different fork arms. For the power divider, the single-frequency spin wave can propagated from the fork handle into fork arms with equal amplitude but different phases. For circulators, spin waves excited in different ports propagate unidirectionally and nonreciprocally with a field-controlled chirality of the circulation. Our findings can enrich the investigation of magnonic and spintronic devices.