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Theory for anisotropic local ferroelectric switching.

Y M Fomichov1, P V Yudin1,2, M Tyunina1,3

  • 1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic.

Nanotechnology
|October 20, 2023
PubMed
Summary

We developed a 2D model for ferroelectric domain switching, explaining unique domain shapes by including surface charge transport and translational symmetry. This research aids in designing ferroelectric devices like racetrack memories.

Keywords:
anisotropicdomain wallferroelectricswitchingstheories

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational modeling

Background:

  • Understanding ferroelectric polarization switching is crucial for device applications.
  • Existing models struggle to explain observed domain anisotropies.

Purpose of the Study:

  • To develop a simplified 2D model for simulating polarization switching.
  • To explain the formation of diverse domain shapes in ferroelectrics.
  • To highlight the importance of translational symmetry in domain behavior.

Main Methods:

  • In-plane 2D theoretical modeling.
  • Incorporation of surface charge transport.
  • Simulation of electric field evolution driving domain growth.
  • Modulation of dielectric permittivity to mimic domain wall pinning.

Main Results:

  • The model successfully reproduces varied domain shapes (round to faceted) in KTiOPO4 and LiNbO3.
  • Demonstrates that translational symmetry is essential for explaining domain anisotropy.
  • Contrasts with previous approaches relying solely on point symmetry invariants.

Conclusions:

  • The proposed model offers a simpler yet effective approach to understanding ferroelectric domain switching.
  • Findings are relevant for optimizing ferroelectric materials for applications such as racetrack memories.
  • Emphasizes the role of translational symmetry in predicting domain morphology.