Unexpected Giant Microwave Conductivity in a Nominally Silent BiFeO3 Domain Wall

Yen Lin Huang, Lu Zheng, Peng Chen, Xiaoxing Cheng, Shang Lin Hsu, Tiannan Yang, Xiaoyu Wu, Louis Ponet, Ramamoorthy Ramesh, Long Qing Chen, Sergey Artyukhin*, Ying Hao Chu, Keji Lai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Nanoelectronic devices based on ferroelectric domain walls (DWs), such as memories, transistors, and rectifiers, have been demonstrated in recent years. Practical high-speed electronics, on the other hand, usually demand operation frequencies in the gigahertz (GHz) regime, where the effect of dipolar oscillation is important. Herein, an unexpected giant GHz conductivity on the order of 103 S m−1 is observed in certain BiFeO3 DWs, which is about 100 000 times greater than the carrier-induced direct current (dc) conductivity of the same walls. Surprisingly, the nominal configuration of the DWs precludes the alternating current (ac) conduction under an excitation electric field perpendicular to the surface. Theoretical analysis shows that the inclined DWs are stressed asymmetrically near the film surface, whereas the vertical walls in a control sample are not. The resultant imbalanced polarization profile can then couple to the out-of-plane microwave fields and induce power dissipation, which is confirmed by the phase-field modeling. Since the contributions from mobile-carrier conduction and bound-charge oscillation to the ac conductivity are equivalent in a microwave circuit, the research on local structural dynamics may open a new avenue to implement DW nano-devices for radio-frequency applications.

Original languageEnglish
Article number1905132
Number of pages6
JournalAdvanced Materials
Issue number9
StatePublished - 1 Mar 2020


  • ac conductivity
  • bismuth ferrite
  • domain wall nanoelectronics
  • microwave microscopy


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