The Discrete Noise of Magnons
S. Rumyantsev, M. Balinskiy, F. Kargar, A. Khitun, A. A. Balandin

TL;DR
This paper investigates the fundamental noise characteristics of magnonic devices, revealing that their low-frequency noise is dominated by random telegraph signals rather than 1/f noise, with noise levels increasing at nonlinear dissipation thresholds.
Contribution
It provides the first detailed analysis of low-frequency noise in magnonic devices, highlighting the dominance of telegraph signal noise and its dependence on power levels, contrasting with electronic device noise.
Findings
Low-frequency noise in magnonic devices is dominated by telegraph signals.
Noise level increases sharply at the onset of nonlinear dissipation.
Magnonic noise characteristics differ fundamentally from electronic counterparts.
Abstract
Magnonics is a rapidly developing subfield of spintronics, which deals with devices and circuits that utilize spin currents carried by magnons - quanta of spin waves. Magnon current, i.e. spin waves, can be used for information processing, sensing, and other applications. A possibility of using the amplitude and phase of magnons for sending signals via electrical insulators creates conditions for avoiding Ohmic losses, and achieving ultra-low power dissipation. Most of the envisioned magnonic logic devices are based on spin wave interference, where the minimum energy per operation is limited by the noise level. The sensitivity and selectivity of magnonic sensors is also limited by the low frequency noise. However, the fundamental question "do magnons make noise?" has not been answered yet. It is not known how noisy magnonic devices are compared to their electronic counterparts. Here we…
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