First-principles study of 180 domain walls in BaTiO3: Mixed Bloch-Néel-Ising character

Menglei Li, Yijia Gu, Yi Wang, Long Qing Chen, Wenhui Duan

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

The 180 ferroelectric domain walls (FDWs) have long been regarded as purely Ising type in ferroelectrics, but recent theoretical works suggested that they can also have Néel- and/or Bloch-like rotations. Using a combination of first-principles calculations with phase-field simulations, we studied the 180 FDWs on different crystallographic planes in prototypical ferroelectric perovskite BaTiO3. The polarization profiles of 180 FDWs on (100) and (410) planes revealed that the (100)- and (410)-FDWs both exhibit Néel-like character besides their intrinsic Ising character, while the (410)-FDW also simultaneously shows a Bloch-like oblique of ∼6 nm, as a consequence of the deviation of polarization gradient from the high symmetry direction. Due to the existence of the Néel-like component of polarization, 180 FDWs in BaTiO3 exhibit a multilayer charge redistribution and thus may strongly trap charged defects.

Original languageEnglish (US)
Article number054106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number5
DOIs
StatePublished - Aug 13 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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