Nonlinear interactions of acoustic modes in ferromagnets near magnetoacoustic resonance: Effective elastic constants |
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Authors: | I. F. Mirsaev |
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Affiliation: | (1) Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620219 Ekaterinburg, Russia |
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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. Fiz. Tverd. Tela (St. Petersburg) 40, 2080–2084 (November 1998) |
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