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The magnetoelectric effect in thin films of ferromagnetic semiconductor La 2 NiMnO 6
Author(s) -
Apostolov A. T.,
Apostolova I. N.,
Wesselinowa J. M.
Publication year - 2014
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.201350307
Subject(s) - condensed matter physics , ferromagnetism , materials science , thin film , phonon , dielectric , semiconductor , magnetic field , dielectric function , coupling (piping) , phase (matter) , physics , nanotechnology , composite material , optoelectronics , quantum mechanics
Within a microscopic model and a Green's function technique we have calculated the temperature, size and magnetic field dependence of the phonon energy ω and damping γ of the B g mode, as well as the real and imaginary part of the dielectric function, ε 1 and ε 2 , respectively, in double perovskite La 2 NiMnO 6 thin films. All these quantities show anomalies at the magnetic phase transition temperature T C indicating a strong magnetoelectric coupling. They increase with decreasing film thickness. An external magnetic field enhances ε 1 and ε 2 and the kink disappears. Comparison to the bulk case and to experimental data is made.