This article is cited in 5 papers

Magnetism

Polarization modes in the Ba$_2$Mg$_2$Fe$_{12}$O$_{22}$ multiferroic

G. A. Komandin^a, A. S. Prokhorov^ab, V. I. Torgashev^c, E. S. Zhukova^ab, B. P. Gorshunov^ab, A. A. Bush<sup>d

a</sup> Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^b Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region
^c Southern Federal University, Rostov-on-Don
^d MIREA — Russian Technological University, Moscow

Abstract: The spectra of complex permittivity of a Ba$_2$Mg$_2$Fe$_{12}$O$_{22}$ 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 Ba$_2$Mg$_2$Fe$_{12}$O$_{22}$ 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.

Received: 15.07.2010
Accepted: 30.09.2010

 English version: Physics of the Solid State, 2011, 53:4, 736–744

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