Nanoscale Origins of Nonlinear Behavior in Ferroic Thin Films
Nanoscale Origins of Nonlinear Behavior in Ferroic Thin Films
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DOI：
10.1002/adfm.201201025
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发表时间：
2013-01
影响因子：
19
通讯作者：
R. Vasudevan;M. Okatan;C. Duan;Yoshitaka Ehara;H. Funakubo;Amit Kumar;S. Jesse;Long-Qing Chen;Sergei V. Kalinin;V. Nagarajan
中科院分区：
文献类型：
--
作者：
R. Vasudevan;M. Okatan;C. Duan;Yoshitaka Ehara;H. Funakubo;Amit Kumar;S. Jesse;Long-Qing Chen;Sergei V. Kalinin;V. Nagarajan
铁磁体对外加场的非线性响应已经通过唯象瑞利定律研究了一百多年。然而，尽管如此，导致宏观瑞利行为的纳米级基本物理机制仍然很难理解，并且小长度尺度的实验证据有限。在这里，它是使用扫描探针技术和相场建模的组合，在原型Pb（Zr，Ti）O3薄膜的纳米压电响应似乎遵循一个明显的非瑞利政权。通过统计分析，发现局部响应的平均化可以直接导致宏观尺度上应变的瑞利样行为。相场建模证实铁弹性界面的扭曲是增强压电响应的关键。这些研究揭示了无序铁电体非线性行为的纳米尺度起源。
The nonlinear response of a ferroic to an applied field has been studied through the phenomenological Rayleigh Law for over a hundred years. Yet, despite this, the fundamental physical mechanisms at the nanoscale that lead to macroscopic Rayleigh behavior have remained largely elusive, and experimental evidence at small length scales is limited. Here, it is shown using a combination of scanning probe techniques and phase field modeling, that nanoscale piezoelectric response in prototypical Pb(Zr,Ti)O3 films appears to follow a distinctly non‐Rayleigh regime. Through statistical analysis, it is found that an averaging of local responses can lead directly to Rayleigh‐like behavior of the strain on a macroscale. Phase‐field modeling confirms the twist of the ferroelastic interface is key in enhancing piezoelectric response. The studies shed light on the nanoscale origins of nonlinear behavior in disordered ferroics.