Publication Type:Journal Article
Source:Physical Review Letters, American Physical Society, Volume 99, Number 21 (2007)
Keywords:bismuth compounds, Domain structure, Domain walls, Epitaxial films, Ferroelastic domain stability, Piezoelectric force microscopy, Strain control, Stress concentration, Thermodynamic stability
We have studied the stability of domains and domain walls in multiferroic BiFeO3 thin films using a combination of piezoelectric force microscopy and phase-field simulations. We have discovered that a film-substrate misfit strain may result in a drastically different thermodynamic stability of two parallel domain walls with the same orientation. A fundamental understanding of the underlying physics, the stress distribution in a domain structure, leads to a novel approach to control the ferroelastic domain stability in the multiferroic BiFeO3 system. © 2007 The American Physical Society.
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