Abstract
This study investigates magnonic noise in the context of parametric spin-wave pumping in a yttrium iron garnet waveguide. By analyzing the input power dependence of parametric spin-wave spectra, we observed spectrum broadening and the emergence of additional pumping channels. A threshold power of 99.9 mW was determined based on spin-wave voltage. To elucidate magnon dynamics beyond the threshold, magnonic noise was examined, revealing its greater sensitivity to magnon scattering compared to spin-wave voltage. The detection of four-magnon scattering and its power-dependent behavior provides further insights into magnon interactions. Our findings contribute to a deeper understanding of magnon dynamics in parametric pumping, a critical process in magnonics.
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