Mode-dependent magnonic noise

The performance of magnonic devices such as converters, switches, and multiplexers greatly depends on magnonic noise. While a peculiar discrete magnonic noise has been previously reported, the sources of underlying magnon dynamics occurring in high-magnon density conditions have not been clarified. Here, zero-span measurements of the spectrum analyzer were recorded to accurately detect magnonic noise as a fluctuation of the spin-wave amplitude. The results of low-frequency magnonic noise demonstrated a spin-wave mode dependency, indicating the existence of a peculiar magnon surface state. Furthermore, the energy thresholds of four-magnon scattering and autooscillation were determined using magnonic white noise. The noise data obtained in this study can help promote theoretical and experimental research on magnons. This study examines magnonic noise, a variation in spin-wave amplitude, which could offer crucial data about carrier dynamics in magnonic devices. The researchers, headed by R.F. and K.S., utilized a method known as zero-span operation of a spectrum analyser (an instrument used to examine the spectral composition of electrical, acoustic, or optical waveform) to measure magnonic noise. The study showed that magnonic noise is sensitive to both surface and internal spin-wave turbulence. They also discovered that the noise measurements permitted the direct assessment of the energy thresholds of four-magnon scattering and auto-oscillation. The findings propose that magnonic noise measurements could be a potent tool in designing future magnonic devices. The study concludes that more research is needed to detect magnonic noise at low magnon density for more efficient magnonic device design.This summary was initially drafted using artificial intelligence, then revised and fact-checked by the author. Magnonic noise has unveiled magnon dynamics, including nonlinear scattering processes.