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- W2007752431 abstract "The origin of a recently reported peculiar phenomenon---polarization reversal against the applied electric field in ferroelectric thin films [M. Aplanalp and P. Gunter, Ferroelectrics 258, 3 (2001), T. Morita and Y. Cho, Appl. Phys. Lett. 84, 257 (2004)]---has been identified. The phenomenon is observed when poling a ferroelectric film with a large electric field applied to a conductive tip of an atomic force microscope (AFM). The effect seems to be of quite general nature as it has been observed on $mathrm{Ba}mathrm{Ti}{mathrm{O}}_{3}$ [Aplanalp et al., Phys. Rev. Lett. 86, 5799 (2001)] as well as on $mathrm{Li}mathrm{Ta}{mathrm{O}}_{3}$ films [I. Morita and Y. Cho Appl. Phys. Lett. 84, 257 (2004)]. It was proposed that this switching is provoked by mechanical stress due to the Maxwell force between tip and bottom electrode [Aplanalp et al., Phys. Rev. Lett. 86, 5799 (2001)]. We have studied the same phenomenon in $mathrm{Pb}{mathrm{Zr}}_{0.4}{mathrm{Ti}}_{0.6}{mathrm{O}}_{3}$ (PZT) thin films, deposited as epitaxial film on conductive, Nb-doped $mathrm{Sr}mathrm{Ti}{mathrm{O}}_{3}$ single crystals. New experimental evidence strongly supports a different explanation. The poling process is accompanied by considerable charge injection leading to important space charges inside the ferroelectric film. These charges finally can lead, for given conditions, to a polarization reversal when the applied voltage to the conductive AFM tip is set to zero. Two analytical models are proposed to explain field inversion in the upper part of the film." @default.
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- W2007752431 date "2005-12-22" @default.
- W2007752431 modified "2023-10-15" @default.
- W2007752431 title "Polarization reversal due to charge injection in ferroelectric films" @default.
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- W2007752431 doi "https://doi.org/10.1103/physrevb.72.214120" @default.
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