Probing local ionic dynamics in functional oxides at the nanoscale

Evgheni Strelcov, Yunseok Kim, Stephen Jesse, Ye Cao, Ilia N. Ivanov, Ivan I. Kravchenko, Chih Hung Wang, Yung Chun Teng, Long Qing Chen, Ying Hao Chu, Sergei V. Kalinin

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

A scanning probe microscopy technique for probing local ionic dynamics in electrochemically active materials based on the first-order reversal curve current-voltage (FORC-IV) method is presented. FORC-IV imaging mode is applied to a Ca-substituted bismuth ferrite (Ca-BFO) system to separate the electronic and ionic phenomena in this material and visualize the spatial variability of these behaviors. The variable-temperature measurements further demonstrate the interplay between the thermally and electric-field-driven resistance changes in Ca-BFO. The FORC-IV is shown to be a simple, powerful, and flexible method for studying electrochemical activity of materials at the nanoscale and, in conjunction with the electrochemical strain microscopy, it can be used for differentiating ferroelectric and ionic behaviors.

Original languageEnglish (US)
Pages (from-to)3455-3462
Number of pages8
JournalNano letters
Volume13
Issue number8
DOIs
StatePublished - Aug 14 2013

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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