Fig. 3: Phase stability of NLSWs.
a The rf-driving field at frf (green) results in parametrically generated magnons at half-integer multiples of the driving frequency with two distinct phase states. The solid lines depict the 0-state in blue and the π-state in yellow for the 3/2 frf non-linearity while the dotted line show the corresponding states for 1/2 frf. b The rf-power modulation as a function of time while the phase of the NLSW response is depicted in c. The phase of the NLSW signal randomly jumps to the π-state or stays in the 0-state after switching the rf-output back to the initial level. Switching events are depicted by green dots. Panels d and e show two spatially-resolved measurements of a 20 μm × 10 μm elliptical element at slightly different field values revealing different regions of stability. f, g, and h Field-dependent measurements performed in the center of the ellipse where the signal is detected for 50 s at each field step resulting in an averaged amplitude R, a corresponding standard deviation σ and a counter for the number of phase switching events N, respectively.
