Strain control of domain-wall stability in epitaxial BiFeO3 (110) films |
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Authors: | Cruz M P Chu Y H Zhang J X Yang P L Zavaliche F He Q Shafer P Chen L Q Ramesh R |
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Institution: | Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA. |
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Abstract: | 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. |
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