Fig. 3: Threshold characteristics of the nonlinear spin waves.
From: Emergent coherent modes in nonlinear magnonic waveguides detected at ultrahigh frequency resolution
The intensities at fp/2, as measured on a CPW1 and b CPW2, are plotted as a function of field and power. The top axis indicates the values kx relevant to excite fp/2 calculated from the BVMSW mode. The minimum excitation power is reached at about 28.7 mT, which corresponds to kx = 0.5 rad/μm (maximum CPW coupling efficiency). In (b), the signal from CPW2 is plotted. It contains an additional branch at a larger field and power. The black and orange solid lines show the calculated threshold power Pth based on Eq. (1) with nonlinear magnon frequency shift of Δf = 32 MHz and Δf = 0, respectively. Two different top axes are shown for (b) as the differently colored curves are based on distinct magnon dispersions.
