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Strain Control of Domain-Wall Stability in Epitaxial BiFeO 3 (110) Films

2007; American Physical Society; Volume: 99; Issue: 21 Linguagem: Inglês

10.1103/physrevlett.99.217601

1092-0145

M. P. Cruz, Ying‐Hao Chu, J. X. Zhang, Peng Yang, F. Zavaliche, Qing He, Padraic Shafer, Long‐Qing Chen, R. Ramesh,

Magnetic Properties and Applications

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.