info:eu-repo/semantics/article
La0.5Sm0.5FeO3: a new candidate for magneto-electric coupling at room temperature
Fecha
2017-07Registro en:
Ranieri, M. G. A.; Cilense, M.; Aguiar, E.C.; Simões, A. Z.; Ponce, Miguel Adolfo; et al.; La0.5Sm0.5FeO3: a new candidate for magneto-electric coupling at room temperature; Springer; Journal of Materials Science: Materials in Electronics; 28; 14; 7-2017; 10747-10757
0957-4522
1573-482X
CONICET Digital
CONICET
Autor
Ranieri, M. G. A.
Cilense, M.
Aguiar, E.C.
Simões, A. Z.
Ponce, Miguel Adolfo
Longo, E.
Resumen
Samarium substituted lanthanum orthoferrite La0:5Sm0:5FeO3 thin film has been prepared by soft chemical method. A single perovskite phase with orthorhombic crystallographic structure was attained. Magnetic and ferroelectric orderings of the film is observed at room temperature (RT). The magnetization of the sample measured at room temperature increases non-linearly with the increase of magnetic field, which suggests the presence of dipole–dipole/exchange interaction in the sample. The resistivity measured in the temperature range 25–375 °C showed that the film is a semiconducting material with low resistivity. The Cole–Cole model reveals different grain boundaries electrical resistance caused by the equilibrium concentration of oxygen vacancies in orthoferrite and that the addition of samarium results in loss of oxygen during sintering. The ferroelectric behaviour of La0:5Sm0:5FeO3 at RT is also confirmed by its capacitance–voltage (C–V) characteristic suggesting a weak ferroelectric behaviour at room temperature. The variation of dielectric constant as a function of frequency predicts the presence of spontaneous polarization in the sample. The semiconductor electrical behavior of the La0:5Sm0:5FeO3 is mainly composed of tunneling current.