Interface effect on ferroelectricity at the nanoscale

Chun Gang Duan, Renat F. Sabirianov, Wai Ning Mei, Sitaram S. Jaswal, Evgeny Y. Tsymbal

Research output: Contribution to journalArticlepeer-review

173 Scopus citations


Interfaces play a critical role in nanoscale ferroelectricity. We perform a first-principles study of ultrathin KNbO 3 ferroelectric films placed between two metal electrodes, either SrRuO 3 or Pt. We show that bonding at the ferroelectric-metal interfaces imposes severe constraints on the displacement of atoms, destroying the bulk tetragonal soft mode. If the interface bonding is sufficiently strong, the ground-state represents a ferroelectric domain with an interface domain wall, driven by the intrinsic oppositely oriented dipole moments at the two interfaces. The critical thickness for the net polarization of the KNbO 3 film is predicted to be about 1 nm for Pt and 1.8 nm for SrRuO 3 electrodes.

Original languageEnglish (US)
Pages (from-to)483-487
Number of pages5
JournalNano Letters
Issue number3
StatePublished - Mar 2006
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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