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Insulating interlocked ferroelectric and structural antiphase domain walls in multiferroic YMnO3
1Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
Nature Materials
|February 16, 2010
Summary
Hexagonal YMnO3 exhibits unique ferroelectricity due to structural trimerization. Researchers revealed a novel conductive domain structure, showing ferroelectric and structural domains are locked, impacting material properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Hexagonal YMnO3 (h-YMnO3) displays improper ferroelectricity driven by structural trimerization.
- Its potential for ferroelectric memory and coexisting ferroelectricity-magnetism drives extensive research.
- The precise ferroelectric domain structure and its link to structural domains remain uncharacterized.
Purpose of the Study:
- To elucidate the true ferroelectric domain structure in hexagonal YMnO3.
- To investigate the relationship between ferroelectric domains and structural domains.
- To understand the impact of this coupling on electrical properties and poling behavior.
Main Methods:
- Transmission electron microscopy (TEM) for high-resolution imaging.
- Conductive atomic force microscopy (c-AFM) to probe local conductivity.
- Analysis of polarization orientation and structural antiphase relationships.
Main Results:
- Observed a unique conductive 'cloverleaf' domain pattern with six domains originating from a single point.
- Demonstrated mutual locking between ferroelectric domain walls and structural antiphase boundaries.
- Found locked walls to be insulating, leading to incomplete poling and a more conductive ferroelectric state than the paraelectric state.
Conclusions:
- The study reveals intricate coupling between structural trimerization, ferroelectricity, magnetism, and charge conduction in h-YMnO3.
- Locked domain walls and antiphase boundaries significantly influence the material's electrical properties and poling efficiency.
- These findings offer new insights into the complex physics of hexagonal multiferroic materials.
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