Polarity-dependent kinetics of ferroelectric switching in epitaxial BiFeO3(111) capacitors

We report on the intriguing polarity-dependent kinetics of polarization switching in epitaxial BiFeO3(111) capacitors. Two seemingly incompatible switching kinetics were observed depending on the polarity of the applied switching bias. Under a negative switching bias, the polarization switching proc...

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Veröffentlicht in:Applied physics letters 2011-07, Vol.99 (1)
Hauptverfasser: Kim, T. H., Baek, S. H., Yang, S. M., Kim, Y. S., Jeon, B. C., Lee, D., Chung, J.-S., Eom, C. B., Yoon, J.-G., Noh, T. W.
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Sprache:eng
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Zusammenfassung:We report on the intriguing polarity-dependent kinetics of polarization switching in epitaxial BiFeO3(111) capacitors. Two seemingly incompatible switching kinetics were observed depending on the polarity of the applied switching bias. Under a negative switching bias, the polarization switching process occurs mainly through sideways domain wall motion, but under a positive switching bias, domain nucleation governs the polarization reversal. The modified piezoresponse force microscopy reveals these polarity-dependent ferroelectric domain evolutions. This polarity dependence of ferroelectric switching kinetics is attributed to defect-related local fields that have different distributions near film/electrode interfaces, probably due to structural relaxation in the BiFeO3(111) film.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3609235