Computer Simulations of Frequency-Dependent Dielectric Response of 90-Degree Domain Walls in Tetragonal Barium Titanate

Abstract

Dissipation-limited motion of 90-degree domain walls in a defect-free BaTiO ₃ crystal under external electric field is investigated by computer simulations in the framework of Landau-Khalatnikov equation of motion and generalized Ginzburg-Landau-Devonshire model. Domain wall mobility determined directly from simulation of frequency dependent dielectric response is shown to be in a reasonable agreement with simple analytical estimates.

Keywords:

• Ferroelectric and ferroelastic domains
• BaTiO₃
• Ginzburg-Landau theory
• mobility

Acknowledgments

This work has been supported by the Grant Agency of the Czech Republic (project 202/06/0411).