Extended Data Fig. 6: Estimation of the amplitude of the nonlinear conversion compared to the direct excitation amplitude.
From: Canted spin order as a platform for ultrafast conversion of magnons
a) Magnitude, real and imaginary part of the Fourier transform with respect to the probe delay t, at the frequency fk. b) Comparison of the signals at various pump delays indicated in the left panel with the spheres. At long pump delays, we expect the spin precession to be damped, thus decreasing the contribution of the nonlinearity to the amplitudes of the signals. Indeed, we see that for the long time delays, the phase of the oscillations does not change, implying that interference is the main contributor to the oscillation amplitude. One can also observe that the amplitude of the conversion is in the same order of magnitude as the direct excitation of propagating magnons.
