La0.5Sm0.5FeO3: a new candidate for magneto-electric coupling at room temperature
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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.
KeywordsPerovskite Leakage Current Density Schottky Barrier Height LaFeO3 Space Charge Polarization
This research project was financially supported by the Brazilian research funding agency FAPESP 2013/07296-2.
- 7.E Traversa, S Matsushuma, G. Okada, Y. Sadaoka, Y. Sakai, K. Watanabe, NO2 sensitive LaFeO3, thin films prepared by R.F. Sputtering. Sens. Actuator B 661(1), 24–25 (1995)Google Scholar
- 16.N.G. Eror, H.U. Anderson, Polymeric precursor synthesis of ceramic materials, MRS Online Proc. Libr. 73, 571 (1986)Google Scholar
- 19.M.P. Pechini, Method of preparing lead and alkaline earth titanates and niobates and coating method using the same to form a capacitor. US Pat. No 3 330 697 (1967)Google Scholar
- 25.M. Seitz, F. Hampton, W. Richmond, Influence of chemisorbed oxygen on the ac electrical behavior of polycrystalline ZnO. Adv. Ceram. 7, 60–70 (1983)Google Scholar
- 27.M.A. Ponce, C.M. Aldao, M.S. Castro, Capacitance and resistance measurements of SnO2 thick-films. J. Mater. Sci. 20, 25–32 (2009)Google Scholar
- 36.J. Ross MacDonald ed. Impedance Spectroscopy, Emphasizing Solid Materials and Systems, (Wiley & Sons, New York, 1987)Google Scholar