Polarization modes in the Ba2Mg2Fe12O22 multiferroic |
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| Authors: | G. A. Komandin A. S. Prokhorov V. I. Torgashev E. S. Zhukova B. P. Gorshunov A. A. Bush |
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| Affiliation: | 1.Prokhorov General Physics Institute,Russian Academy of Sciences,Moscow,Russia;2.Moscow Institute of Physics and Technology (State University),Dolgoprudnyi, Moscow region,Russia;3.Southern Federal University,Rostov-on-Don,Russia;4.Moscow State Institute of Radio Engineering,Electronics, and Automation (Technical University),Moscow,Russia |
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| Abstract: | The spectra of complex permittivity of a Ba2Mg2Fe12O22 single crystal belonging to the family of Y-type hexaferrites have been measured over a wide temperature range (10–300 K) with the aim of determining the dynamic parameters of the phonon and magnetic subsystems in the terahertz and infrared frequency ranges (3–4500 cm−1). A factor-group analysis of the vibrational modes has been performed, and the results obtained have been compared with the experimentally observed resonances. The oscillator parameters of all nineteen phonon modes of E u symmetry, which are allowed by the symmetry of the Ba2Mg2Fe12O22 crystal lattice, have been calculated. It has been found that, at temperatures below 195 and 50 K, the spectral response exhibits new absorption lines due to magnetic excitations. |
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