Structural evolution and enhanced piezoresponse in cobalt-substituted BiFeO3thin films

Hajime Hojo, Ko Onuma, Yuichi Ikuhara, Masaki Azuma

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The role of cobalt substitution in the crystal structure and piezo/ferroelectric properties of BiFeO3(BFO) thin films was studied. With the aid of epitaxial strain, (1% x)BiFeO3-xBiCoO3(BFCO) (0 ≤ x ≤ 0.12) films were stabilized on SrTiO3substrates, and an enhancement in their piezoresponses was observed. In the x = 0.15 BFCO film, an unconventional strain relaxation behavior, resulting in V-shaped domains of a "giant-c/a " phase of approximately 1.25, was observed. This observation demonstrates that the crystal structure and piezo /ferroelectric properties of BFO can be finely tuned by a combination of cobalt substitution and epitaxial strain.

Original languageEnglish
Article number091501
JournalApplied Physics Express
Issue number9
Publication statusPublished - Sept 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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