Unraveling the origins of electromechanical response in mixed-phase bismuth ferrite
Unraveling the origins of electromechanical response in mixed-phase bismuth ferrite
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揭示混合相铁氧体机电响应的起源
DOI：
10.1103/physrevb.88.020402
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发表时间：
2013-07
影响因子：
3.7
通讯作者：
V. Nagarajan
中科院分区：
文献类型：
--
作者：
M. B. Okatan;Y. Y. Liu;S. Jesse;J. C. Yang;W. I. Liang;Y. H. Chu;J. Y. Li;S. V. Kalinin;V. Nagarajan
利用亚矫顽扫描探针显微镜的多次谐波测量方法研究了混合相菱面体-四面体BiFeO 3薄膜中巨机电响应的起源。显着的贡献，应变产生的二阶谐波响应本地化的相边界。由热力学计算支持的应变和耗散数据表明，增强的机电响应的来源是相边界的运动。这些研究结果阐明了不稳定的相界，自然和人工，在实现具有巨大的机电性能的薄膜的关键作用。
The origin of giant electromechanical response in a mixed-phase rhombohedral-tetragonal BiFeO3 thin film is probed using sub-coercive scanning probe microscopy based multiple-harmonic measurements. Significant contributions to the strain arise from a second-order harmonic response localized at the phase boundaries. Strain and dissipation data, backed by thermodynamic calculations suggest that the source of the enhanced electromechanical response is the motion of phase boundaries. These findings elucidate the key role of labile phase boundaries, both natural and artificial, in achieving thin films with giant electromechanical properties.