Mechanism of polarization fatigue in BiFeO 3

Xi Zou, Lu You, Weigang Chen, Hui Ding, Di Wu, Tao Wu, Lang Chen, Junling Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Fatigue in ferroelectric oxides has been a long lasting research topic since the development of ferroelectric memory in the late 1980s. Over the years, different models have been proposed to explain the fatigue phenomena. However, there is still debate on the roles of oxygen vacancies and injected charges. The main difficulty in the study of fatigue in ferroelectric films is that the conventional vertical sandwich structure prevents direct observation of the microscopic evolution through the film thickness during the electric field cycling. To circumvent this problem, we take advantage of the large in-plane polarization of BiFeO 3 and conduct direct domain and local electrical characterizations using a planar device structure. The combination of piezoresponse force microscopy and scanning kelvin probe microscopy allows us to study the local polarization and space charges simultaneously. It is observed that charged domain walls are formed during the electrical cycling, but they do not cause polarization fatigue. After prolonged cycling, injected charges appear at the electrode/film interfaces, where domains are pinned. When the pinned domains grow across the channel, macroscopic fatigue appears. The role of injected charges in polarization fatigue of BiFeO 3 is clearly demonstrated.

Original languageEnglish (US)
Pages (from-to)8997-9004
Number of pages8
JournalACS Nano
Volume6
Issue number10
DOIs
StatePublished - Oct 23 2012

Keywords

  • charge injection
  • charged domain wall
  • fatigue
  • multiferroic
  • scanning kelvin probe microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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