Multiferroic behavior of heterostructures composed of lanthanum and bismuth ferrite |
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| Affiliation: | 1. Faculty of Engineering of Guaratinguetá, São Paulo State University – UNESP, Guaratinguetá, SP, 12516-410 Brazil;2. Interdisciplinary Laboratory of Electrochemistry and Ceramics, LIEC – Chemistry Institute, São Paulo State University – UNESP, Araraquara – SP, Araraquara, SP, 14800-060 Brazil;1. Faculty of Engineering of Guaratinguetá, São Paulo State University – UNESP, Av. Dr Ariberto Pereira da Cunha 333, Bairro Pedregulho, P.O. Box 355, 12.516-410 Guaratinguetá, SP, Brazil;2. Interdisciplinary Laboratory of Electrochemistry and Ceramics, LIEC – Chemistry Institute, São Paulo State University – UNESP, Prof. Francisco Degni Street, 55, Quitandinha, 14800-060 Araraquara, SP, Brazil;3. Research Institute of Materials Science and Technology (INTEMA), National University of Mar del Plata (CONICET), Juan B. Justo Street 4302, 7600 Mar del Plata, Argentina;1. Crystal Lab, Department of Physics & Astrophysics, University of Delhi, Delhi-7, India;2. Department of Electronics, SGTB Khalsa College, University of Delhi, Delhi-7, India;1. Key Laboratory of Fuel Cell Technology of Guangdong Province, Department of Chemistry, College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Organ Failure Research, National Clinical Research Center of Kidney Disease, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China;1. Applied Optics Group, GOA, Federal University of Grande Dourados, Dourados, MS, Brazil;2. Interdisciplinary Laboratory of Electrochemistry and Ceramics, LIEC – Department of Chemistry Techonology, Chemistry Institute, São Paulo State University, Araraquara, SP, Brazil;3. Laboratory for Organic Catalysis and Biocatalysis, University of Grande Dourados, MS, Brazil;4. Materials Chemistry and Sensors Laboratory – LMSen, Maringá State University, Maringá, PR, Brazil;1. Interdisciplinary Laboratory of Electrochemistry and Ceramics, LIEC – Chemistry Institute, São Paulo State University – UNESP, Araraquara, SP, Brazil;2. Faculty of Engineering of Guaratinguetá, São Paulo State University – UNESP, Guaratinguetá, SP, Brazil |
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| Abstract: | Heterostructured thin films of lanthanum ferrite (LFO) and bismuth ferrite (BFO) with different thicknesses were successfully obtained by a soft chemical method. The films were deposited by spin-coating and annealed at 500 °C for 2 h. The XRD pattern confirmed the purity of the thin films, where no additional peaks associated with impurity phases were present. The morphology analysis showed spherical grains with a random size distribution. The grain sizes increased with the number of BFO layers. The average grain size varied from 43 nm to 68 nm. The best dielectric results were obtained for the film with 6 LFO sublayers and 4 BFO top layers, in which the dielectric constant showed low dispersion. Since the capacitance-voltage curve for the film 6-LFO/4-BFO is symmetrical around null voltage, it can be inferred that this heterostructure has few mobile ions and accumulated charges on the film-substrate interface. In this film, polarization remains almost constant during 1012 cycles before the onset of degradation, which shows the very high resistance of the films to fatigue. Magnetoelectric coefficient measurements of the films revealed the formation of hysteresis loops, and a maximum value of 12 V/cmOe was obtained for the magnetoelectric coefficient in the longitudinal direction; this value is much higher than that previously reported for pure BFO thin films. |
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| Keywords: | A Films C Electrical properties C Magnetic properties E Functional applications |
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