Comparison of structural and electric properties of PbZr0.2Ti0.8O3 and CoFe2O4/PbZr0.2Ti0.8O3 films on (100) LaAlO3


In this work, we investigated structural, electrical, and magnetic properties of ferroelectric PbZr0.2Ti0.8O3 (PZT) and ferrimagnetic/ferroelectric [CoFe2O4(CFO)/PZT] bilayers grown on (100)LaAlO3 (LAO) substrates supplied with bottom 50 nm thick LaNiO3 electrodes. Interestingly, structural and electrical properties of the PZT layer exhibited remarkable changes after the top-layer CFO deposition. X-ray diffraction data suggested that both the c- and a-domains exist in the PZT layer and the tetragonality of the PZT decreases upon the top-layer deposition. A variation in the electrical properties of the PZT layer upon the CFO deposition was investigated by polarization versus voltage (P-V), capacitance versus voltage (C-V), and capacitance versus frequency (C-f) measurements. The CFO deposition induced a slight decrease of the remnant polarization and more symmetric behavior of P-V loops as well as led to the improvement of fatigue behavior. The tentative origin of enhanced fatigue endurance is discussed based on the measurement results. These results were corroborated by local piezoelectric measurements. Ferrimagnetic property of the CFO/PZT bilayer was confirmed by magnetic measurement at room temperature. (C) 2011 American Institute of Physics. [doi:10.1063/1.3642977]






Zhang, XD; Dho, J; Park, S; Kwon, H; Hwang, J; Park, G; Kwon, D; Kim, B; Jin, Y; Kim, BG; Karpinsky, D; Kholkin, AL

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This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund, KRF-2008-314-C00127). Bog G. Kim was supported by the National Core Research Center program of Pusan National University (2010-0001226) and by the National Research Foundation Grant (20100015719). X. D. Zhang and Gwangseo Park acknowledge the support from Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. 2011-0012372). This was also supported by the BK21 project. X. D. Zhang, D. Karpinsky, and A. L. Kholkin, also acknowledge FCT for the support within their post-doctoral grants SFRH/BPD/66959/2009 and SFRH/BPD/42506/2007, and FCT project PTDC/FIS/105416/2008, respectively.

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