Polydomain structures in ferroelectric and ferroelastic epitaxial films

Area of Science:

• Materials Science
• Condensed Matter Physics
• Thin Film Physics

Background:

• Domain structures significantly influence the properties of epitaxial films.
• Understanding these structures is crucial for developing advanced functional materials.
• Existing theoretical and computational models require comprehensive validation.

Purpose of the Study:

• To review and integrate theoretical models, phase field modeling, and experimental studies of domain structures in epitaxial films.
• To present a thermodynamic theory for evaluating domain structure parameters.
• To validate computational and theoretical predictions with experimental data.

Main Methods:

• Macroscopic thermo-mechanical framework for thermodynamic theory.
• Energy minimization approach focusing on elastic interactions.
• Phase field modeling incorporating elastic and interfacial energies.
• Experimental characterization of domain structures in epitaxial films.

Main Results:

• Thermodynamic theory quantifies domain fractions and architecture in homophase and heterophase epitaxial films.
• Phase field modeling accurately reproduces theoretical predictions and predicts domain morphology.
• Experimental data validate both the thermodynamic model and phase field modeling results.
• The theory describes conditions for obtaining two-phase structures and their characteristics.

Conclusions:

• The integrated approach of thermodynamic theory, phase field modeling, and experimental validation provides a robust framework for understanding epitaxial film domain structures.
• This framework enables accurate prediction of domain behavior and its impact on functional properties.
• The findings are essential for the rational design and fabrication of high-performance epitaxial films.