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Domains in ferroelectric nanodots.
A Schilling1, D Byrne, G Catalan
1Centre for Nanostructured Media, School of Maths and Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
Nano Letters
|July 14, 2009
Summary
Researchers created ferroelectric barium titanate (BaTiO3) nanodots using focused ion beam patterning. Complex quadrant domain structures formed upon cooling, with the preferred explanation involving minimizing surface charge energy.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Crystallography
Background:
- Ferroelectric materials like barium titanate (BaTiO3) exhibit spontaneous electric polarization.
- Controlling ferroelectric domain structures at the nanoscale is crucial for device applications.
- Previous studies have explored domain formation in bulk ferroelectrics, but nanoscale patterns in confined geometries present unique challenges.
Purpose of the Study:
- To fabricate free-standing nanoscale ferroelectric barium titanate (BaTiO3) dots.
- To investigate the resulting domain structures after cooling through the Curie temperature.
- To propose and evaluate potential mechanisms for the observed complex domain configurations.
Main Methods:
- Focused ion beam (FIB) patterning of bulk single crystal BaTiO3.
- Microscopic observation of domain structures in the fabricated nanodots.
- Theoretical analysis and discussion of domain formation models.
Main Results:
- Successfully fabricated almost free-standing single crystal mesoscale and nanoscale BaTiO3 dots.
- Observed complex quadrant domain structures with fine 90-degree stripe domains after cooling through the Curie temperature.
- Identified three potential models for domain formation: field-closure, phase transition kinetics (Forsbergh patterns), and minimization of surface charge energy.
Conclusions:
- The formation of quadrant domain structures in BaTiO3 nanodots is attributed to complex interactions during the phase transition.
- Minimizing uncompensated surface charge energy is the most favored explanation for the observed equilibrium state.
- The interplay between kinetic and equilibrium effects may contribute to the observed domain patterns.
