Fig. 2: Measurements of the parametric interaction between spin waves and surface acoustic waves.
From: Sustained amplification of coherent spin waves by parametric pumping with surface acoustic waves
a Experimental setup for measuring signal transmission and gain. b Transmission spectra from input to output transducer for various pump powers. c Peak signal output power measured as a function of SAW power for different levels of input signal power. d Gain in transmitted signal power normalized to the unpumped transmission. e Experimental setup for measuring idler power. f Spectra observed at the idler output showing the generated idler signals at fi, along with feedthrough of the signal frequency at fs and spin waves pumped from the thermal background at \({f}_{p}/2\). g Detected idler power as a function of SAW pump power for different levels of input signal power. h Signal detected at exactly \({f}_{p}/2\), resulting from the pumping of spin waves from the thermal background.
