Self-Generation of Spatiotemporal Parametric Patterns in Active Ring Resonators Based on Single- and Bicomponent Magnonic Quasicrystals

The paper presents the experimental results that demonstrate the formation of spatiotemporal parametric patterns in active ring resonators based on one-dimensional single- and bicomponent magnonic quasicrystals (MQCs). Such patterns are formed through the nonlinear parametric three-wave decay of a magnetostatic surface spin wave (MSSW). It is shown that in the active ring resonator based on the single-component MQC made from a ferrite film, the spatial patterns of magnetization are localized in the grooves at a MSSW frequency and in the crests at a frequency of parametrically excited spin waves (SWs). In the active ring resonator based on the bicomponent MQC (the ferromagnetic permalloy strips located on a ferrite film surface), the magnetization localization is observed in free parts of the ferrite film both at the MSSW frequency and at the frequency of parametrically excited SWs.