Fig. 4: Theoretically modeled effect of the nonlinear coupling strength on the observation of magnon-phonon Fermi resonance.
From: Magnon-phonon Fermi resonance in antiferromagnetic CoF2
a Fourier transformation centered around the phonon resonance for the case of weak coupling with α = 0.07. b Fourier transformation centered around the phonon resonance for the case of strong coupling with α = 7. c Phonon weight extracted as an integral value in the shaded frequency region of 1.9–2.0 THz for the weak coupling case (purple line) and the strong coupling case (blue line), respectively. The evident difference for FFT line shapes in the range of μ0Hext = 3–4 T (a, b) and extracted phonon weight (c) clearly emphasizes the mutual coupling between the two magnons and the phonon state.
