Cruz M P, Chu Y H, Zhang J X, Yang P L, Zavaliche F, He Q, Shafer P, Chen L Q, Ramesh R
Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2007 Nov 23;99(21):217601. doi: 10.1103/PhysRevLett.99.217601. Epub 2007 Nov 20.
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.
我们结合压电力显微镜和相场模拟研究了多铁性BiFeO₃薄膜中畴和畴壁的稳定性。我们发现，薄膜与衬底之间的失配应变可能导致具有相同取向的两个平行畴壁的热力学稳定性截然不同。对其 underlying physics（潜在物理机制），即畴结构中的应力分布的基本理解，为控制多铁性BiFeO₃系统中铁弹性畴稳定性提供了一种新方法。
