Field enhancement of electronic conductance at ferroelectric domain walls

Rama K. Vasudevan, Ye Cao, Nouamane Laanait, Anton Ievlev, Linglong Li, Jan Chi Yang, Ying Hao Chu, Long Qing Chen, Sergei V. Kalinin, Petro Maksymovych

研究成果: Article

12 引文 斯高帕斯(Scopus)

摘要

Ferroelectric domain walls have continued to attract widespread attention due to both the novelty of the phenomena observed and the ability to reliably pattern them in nanoscale dimensions. However, the conductivity mechanisms remain in debate, particularly around nominally uncharged walls. Here, we posit a conduction mechanism relying on field-modification effect from polarization re-orientation and the structure of the reverse-domain nucleus. Through conductive atomic force microscopy measurements on an ultra-thin (001) BiFeO3 thin film, in combination with phase-field simulations, we show that the field-induced twisted domain nucleus formed at domain walls results in local-field enhancement around the region of the atomic force microscope tip. In conjunction with slight barrier lowering, these two effects are sufficient to explain the observed emission current distribution. These results suggest that different electronic properties at domain walls are not necessary to observe localized enhancement in domain wall currents.

原文English
文章編號1318
期刊Nature communications
8
發行號1
DOIs
出版狀態Published - 2017 十二月 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Vasudevan, R. K., Cao, Y., Laanait, N., Ievlev, A., Li, L., Yang, J. C., Chu, Y. H., Chen, L. Q., Kalinin, S. V., & Maksymovych, P. (2017). Field enhancement of electronic conductance at ferroelectric domain walls. Nature communications, 8(1), [1318]. https://doi.org/10.1038/s41467-017-01334-5