- Conference date: 9-12 December 1975
- Location: Philadelphia, PA, USA
Brillouin scattering from thermal magnons of the low frequency branch is used to determine with high precision all relevant magnetic parameters of iron borate. Vapor transport grown crystals of high optical quality are employed. Using the backscattering configuration the symmetric and antisymmetric exchange constants are determined for temperatures 77<T<TN. The magnon energy exhibits a remarkable anisotropy which is mainly due to the trigonal lattice distortion. The forward scattering geometry measures magnons with small exchange energy, therefore giving more detailed information about the spin wave energy gap. In addition, ferromagnetic resonance data at various microwave frequencies are reported, comparing favorably with the results of forward scattering.
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