Deaging and asymmetric energy landscapes in electrically biased ferroelectrics.
Deaging and asymmetric energy landscapes in electrically biased ferroelectrics.
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DOI：
10.1103/physrevlett.108.177601
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发表时间：
2012-04
影响因子：
8.6
通讯作者：
G. Tutuncu;Dragan Damjanovic;Jun Chen;Jacob L. Jones
中科院分区：
文献类型：
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作者：
G. Tutuncu;Dragan Damjanovic;Jun Chen;Jacob L. Jones
在铁性材料中，介电、压电、磁性和弹性系数显著地受畴壁运动的影响。这种运动可以被描述为墙穿过各种类型和强度的钉扎中心的传播，这些钉扎中心共同构成了力分布或能量景观。偏置的畴结构和不对称的能量景观可以通过施加高场（例如在电极化期间）来创建，并且在这种状态下的材料行为通常是高度不对称的。在某些情况下，这种行为可以被认为是鲍辛格效应的电模拟。本信使用时间分辨，高能量的X射线布拉格散射探测这种不对称性和相关的去老化效应的铁电morphotropic相界组合物0.36BiScO3 - 0.64PbTiO3。
In ferroic materials, the dielectric, piezoelectric, magnetic, and elastic coefficients are significantly affected by the motion of domain walls. This motion can be described as the propagation of a wall across various types and strengths of pinning centers that collectively constitute a force profile or energetic landscape. Biased domain structures and asymmetric energy landscapes can be created through application of high fields (such as during electrical poling), and the material behavior in such states is often highly asymmetric. In some cases, this behavior can be considered as the electric analogue to the Bauschinger effect. The present Letter uses time-resolved, high-energy x-ray Bragg scattering to probe this asymmetry and the associated deaging effect in the ferroelectric morphotropic phase boundary composition 0.36BiScO3 - 0.64PbTiO3.