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Theoretical study of static and dynamic properties of orthorhombic multiferroic substances
Author(s) -
Wesselinowa J. M.,
Georgiev I.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200844019
Subject(s) - condensed matter physics , multiferroics , polarization density , magnetization , magnetism , ferroelectricity , dielectric , magnetoelectric effect , phase transition , materials science , heisenberg model , orthorhombic crystal system , magnetic field , physics , ferromagnetism , quantum mechanics , diffraction , optoelectronics
The influence of the magnetoelectric coupling and the exchange interaction constants on different magnetic and dielectric properties of orthorhombic RMn 2 O 5 multiferroic materials is studied based on the transverse Ising and Heisenberg models using a Green's function technique. In the vicinity of the phase transition temperature T C we obtain an anomaly, a kink in the temperature dependence of the magnetic properties. This is due to the coexistence of ferroelectricity and magnetism which leads to interplay between the electric and magnetic properties. The spin excitations show a novel softening around T C due to the magnetoelectric coupling. The effect of external electric and magnetic fields is also calculated. We obtain the magnetic‐field‐induced polarization and the electric‐field‐induced magnetization. The obtained results are in qualitative agreement with the experimental data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)