Abstract
The temperature, size and magnetic field dependence of the magnetization M, polarization P and band gap energy in double perovskite Bi2FeCrO6 thin films are calculated on the basis of a microscopic model. The surface and substrate effects are discussed. P shows an anomaly at the Neel temperature TN indicating a strong magnetoelectric coupling. There is a polarization anisotropy. An external magnetic field enhances the polarization and the kink at TN disappears. M and P increase or decrease with decreasing film thickness by substrates which lead to compressive or tensile strains, respectively. Increase of M is also obtained by La ion doping of Bi2FeCrO6 which leads to a compressive strain. We have calculated the band gap in dependence on substrate and doping effects.
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