Substrate Clamping Effects on Irreversible Domain Wall Dynamics in Lead Zirconate Titanate Thin Films
Substrate Clamping Effects on Irreversible Domain Wall Dynamics in Lead Zirconate Titanate Thin Films
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DOI：
10.1103/physrevlett.108.157604
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发表时间：
2012-04-13
影响因子：
8.6
通讯作者：
Trolier-McKinstry, S.
中科院分区：
文献类型：
--
作者：
Griggio, F.;Jesse, S.;Trolier-McKinstry, S.
通过对机械夹持和释放的多晶锆钛酸铅（PZT）薄膜的非线性行为的宏观和局部测量，探索远程应变相互作用对畴壁动力学的作用。释放的薄膜显示出一个戏剧性的变化，在全球的介电非线性和它的频率依赖性作为一个功能的机械夹紧。此外，我们观察到一个过渡，从强集群的非线性响应的夹紧的情况下，几乎均匀的非线性释放膜。这种行为归因于畴壁的迁移率增加。这些结果表明，主导作用的集体应变相互作用介导的局部和整体的力学边界条件上的畴壁动力学。在这封信中提出的工作表明，夹紧膜的测量可能大大低估了压电系数和耦合常数的释放结构中使用的微机电系统，能量收集系统，和microrobots。
The role of long-range strain interactions on domain wall dynamics is explored through macroscopic and local measurements of nonlinear behavior in mechanically clamped and released polycrystalline lead zirconate-titanate (PZT) films. Released films show a dramatic change in the global dielectric nonlinearity and its frequency dependence as a function of mechanical clamping. Furthermore, we observe a transition from strong clustering of the nonlinear response for the clamped case to almost uniform nonlinearity for the released film. This behavior is ascribed to increased mobility of domain walls. These results suggest the dominant role of collective strain interactions mediated by the local and global mechanical boundary conditions on the domain wall dynamics. The work presented in this Letter demonstrates that measurements on clamped films may considerably underestimate the piezoelectric coefficients and coupling constants of released structures used in microelectromechanical systems, energy harvesting systems, and microrobots.