Control of spin wave properties in a planar zigzag-shaped YIG-microwaveguide with a diamond-shaped resonator

The possibility of using the resonance effect to control the signal arising in the process of spin wave (SW) propagation in an iron-yttrium-garnet (YIG) magnetic film with periodic geometry changes in the form of zigzag fractures with the addition of an YIG resonator in the central fracture section has been investigated. Using numerical modelling techniques, it has been shown that the zigzag structure can produce SW non-transmittance zones. It is also shown that it is possible to control the number and depth of the non-transmittance zones on the amplitude-frequency characteristics by varying the distance between the boundary of the YIG microwave waveguide and the resonator. It is demonstrated that the introduction of a diamond-shaped microresonator into the system makes it possible to suppress two frequency zones of non-transmittance at simultaneous formation of one zone with high goodness-of-fit. The reason for the formation of non-transmittance zones in the spectrum of the zigzag magnon structure is similar to the mechanism of formation of forbidden zones in the spectra of SW magnon crystals. The proposed structure can be used as a controlled microwave signal filter.