Non-resonant wave front reversal of spin waves used for microwave signal processing

Abstract

It is demonstrated that non-resonant (ωs = ωp/2) wave front reversal (WFR) of spin-wave pulses (carrier frequency ωs) caused by pulsed parametric pumping (carrier frequency ωp) can be effectively used for microwave signal processing. When the frequency band Ωp of signal amplification by pumping is narrower than the spectral width Ωs of the signal (Ωp ≪ Ωs), the non-resonant WFR can be used for the analysis of the signal spectrum. In the opposite case (Ωp ≫ Ωs) the non-resonant WFR can be used for active (with amplification) filtering of the input signal.

Enhancement of the Spin Pumping Effect by Magnon Confluence Process in YIG/Pt Bilayers

“…Many different fundamental issues in the collective dynamics of bosonic systems were addressed during the last decades using the magnon system. Among them one can note classical magnon dynamics effects like parametrically stimulated recovery of a microwave signal, magnon wave‐front reversal, magnetic solitons and two‐dimensional spin‐wave bullets, strain‐induced magnon effects, nonreciprocity and transformation of spin waves in ferromagnetic‐semiconductor and ferromagnetic‐multiferroic structures, and many others. Simultaneously, novel quantum macroscopic collective phenomena, such as Bose–Einstein condensation (BEC) of magnons, magnon vortices and supercurrents, as well as a space‐time crystal in the magnon BEC open new directions for the utilization of the magnon system.…”

Recent Trends in Microwave Magnetism and Superconductivity

“…It should be noted that the optical wavefront reversal involves second-order four-wave parametric interactions pumped by counter-propagating light waves with frequencies close to those of the source and reversed signals. Spin-wave systems provided the first [49] (a). Dispersion law for a one-side-metallized YIG film (surface waves) [43] (b).…”

“…Vertical dashed line indicates the maximum magnetic field max, at which the WFR of MSSW is possible [43] (c). Experimental (symbols) and calculated (line) dependences of the reversed signal power on the input signal frequency in the regime of broadband input signal (Ωs/Ωp ≈ 3.5) [49]. Inset: the spectrum of the input signal (blue line) and the band of the parametric amplification (green line) (d).…”

Parametric Generation of Propagating Spin Waves in Ultrathin Yttrium Iron Garnet Waveguides

“…By comparing the experiments with the theory, one can point out that there is no abrupt increase of the threshold at the right side of the minima in the experimental curve, in contrast to the theoretical one. This is a consequence of the nonresonant excitation of the SWs near these minima . Indeed, while the nonresonant excitation significantly increases the threshold, in a certain small range, this nonresonant excitation of a mode near the minima is more favorable than the resonant excitation of another mode.…”

“…This is a consequence of the nonresonant excitation of the SWs near these minima. [53,54] Indeed, while the nonresonant excitation significantly increases the threshold, in a certain small range, this nonresonant excitation of a mode near the minima is more favorable than the resonant excitation of another mode.…”