Structure and energetics of ferroelectric domain walls in LiNbO3 from atomic-level simulations

Donghwa Lee, Haixuan Xu, Volkmar Dierolf, Venkatraman Gopalan, Simon R. Phillpot

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Atomistic simulations with empirical potentials and density-functional theory calculations are used to characterize the structure, energetics, and ferroelectric properties of domain walls in LiNbO3. The two methods yield similar polarization patterns and atomic structures at the domain walls. The structure of the domain wall on the mixed anion-cation planes is very different from that of the domain wall on planes of alternating cations and anions. The breaking of the uniaxial symmetry of the ferroelectric phase by the domain walls leads to nonuniaxial contributions to the polarization in the domain-wall region. In particular, a polarization component parallel to the domain walls leads to a Bloch-type rotation while a polarization component normal to the domain walls leads to Néel-type rotation. The polarization profiles at the domain walls are fitted to Ginzburg-Landau-Devonshire theory. The comparison of energetics at equilibrium and at transition states yields estimates of the energy barrier heights for domain-wall motion.

Original languageEnglish (US)
Article number014104
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number1
DOIs
StatePublished - Jul 8 2010

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Domain walls
Ferroelectric materials
domain wall
simulation
Polarization
polarization
Anions
Cations
Negative ions
Positive ions
lithium niobate
anions
cations
Energy barriers
atomic structure
Density functional theory
density functional theory

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Structure and energetics of ferroelectric domain walls in LiNbO3 from atomic-level simulations",
abstract = "Atomistic simulations with empirical potentials and density-functional theory calculations are used to characterize the structure, energetics, and ferroelectric properties of domain walls in LiNbO3. The two methods yield similar polarization patterns and atomic structures at the domain walls. The structure of the domain wall on the mixed anion-cation planes is very different from that of the domain wall on planes of alternating cations and anions. The breaking of the uniaxial symmetry of the ferroelectric phase by the domain walls leads to nonuniaxial contributions to the polarization in the domain-wall region. In particular, a polarization component parallel to the domain walls leads to a Bloch-type rotation while a polarization component normal to the domain walls leads to N{\'e}el-type rotation. The polarization profiles at the domain walls are fitted to Ginzburg-Landau-Devonshire theory. The comparison of energetics at equilibrium and at transition states yields estimates of the energy barrier heights for domain-wall motion.",
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Structure and energetics of ferroelectric domain walls in LiNbO3 from atomic-level simulations. / Lee, Donghwa; Xu, Haixuan; Dierolf, Volkmar; Gopalan, Venkatraman; Phillpot, Simon R.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 1, 014104, 08.07.2010.

Research output: Contribution to journalArticle

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