Abstract
The magnetoelastic contribution ΔĈ(3) to the effective third-order elastic constants Ĉ (3) ef is determined; it describes the additional elastic anharmonicity induced by nonlinear spin-spin and spin-phonon interactions in ferromagnets. In the vicinity of magnetoacoustic resonance, this anharmonicity can be manifested in three-frequency elastic wave interactions, producing magnetoacoustic mode-frequency transformation effects. It is shown that these effects are magnified in resonance as the result of a huge increase (by several orders of magnitude) in the dynamic elastic constants ΔĈ(3). Quantitative estimates are obtained for yttrium iron garnet.
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