The thin films of BFO, binary-doped Bi0.96Sr0.04Fe0.98Co0.02O3, and multi-doped Bi0.96Sr0.04Fe0.94Mn0.04Co0.02O3 are fabricated using the sol–gel method. To study the mechanism for the enhanced intrinsic ferroelectricity in multi-doped BFO, this work uses related aspects including the electrostatic potential energy, the Fermi level, and the Schottky interface barrier. Using multi-doped BFO can reduce the height of the electrostatic barrier and change the Fermi level so that the Schottky barrier height is increased to reduce the leakage current, thereby improving the intrinsic ferroelectricity. Also, using multivalent Mn with a double-exchange effect improves the ferromagnetism. These improved intrinsic ferroelectric and ferromagnetic properties make BFO applicable in various practical devices and fields.
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This work is supported by the Shaanxi Province Key Research and Development Plan (2018GY107); the Project of the National Natural Science Foundation of China (51372145); the Graduate Innovation Fund of Shaanxi University of Science and Technology (SUST-A04); the Natural Science Basic Research Plan in Shaanxi Province of China (2020JQ-730).
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Ren, X., Tan, G., Li, J. et al. Mechanism for enhanced ferroelectricity in multi-doped BiFeO3 thin films. J Mater Sci: Mater Electron 32, 1265–1277 (2021). https://doi.org/10.1007/s10854-020-04900-8