Abstract
Brillouin light scattering (λ=630nm) in thin single crystal plates of Y3Fe5O12 has been studied by optical mixing under an applied transverse RF magnetic field with frequencies 200-400 MHz. FMR spectra have been obtained in the conditions of degeneracy of precession frequencies of the uniform sample magnetization component and natural frequencies of domain wall oscillations. The existence of this frequency degeneracy results in obscuring the FMR signal in RF absorption spectra of magnetically unsaturated crystals.
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