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Information × Registration Number 0214U005295, 0112U001912 , R & D reports Title Spectrum and damping of collective waves in magnetic materials near phase transitions. popup.stage_title Head Baryakhtar, Registration Date 25-12-2014 Organization Institute of magnetism of NASU popup.description2 The dispersion laws of coupled magnetoacoustic waves in magnetically ordered materials of different symmetry were calculated. The analysis of obtained dispersion laws in the vicinity of the spin-pereorientatsiynih phase transitions was performed. The behavior of these spectra in the vicinity of phase transitions in the lattice, namely in the vicinity of martensitic phase transformations in materials with shape memory effect was considered. The results are used for interpretation the experimental data for the Ni-Mn-Ga alloy. the The phenomenon of a sharp decrease of the elastic modules of the alloy at the approach to the martensitic phase transitions was theoretically explained. It is shown that in this case a nonuniform magnetostriction performs the main influence on the elastic properties of the material. A theoretical estimation of the effect of a uniform magnetostriction on the elastic modules of alloys with shape memory effect was performed. The obtained results explain the experimental temperature dependence of the elastic Young's modulus of the Ni-Mn-Ga alloy at the paramagnetic-ferromagnetic transformation. Product Description popup.authors Бар'яхтар В.Г. Данилевич О.Г. Данилевич О.Й. Духота Л.І. Калькута С. А. Косогор А.О. Кубишта Л.С. Лежненко І. В. Львов В.А. Черненко М.А. popup.nrat_date 2020-04-02 Close