Polar and toroidal electromechanical properties designed by ferroelectric nano-metamaterials
Polar and toroidal electromechanical properties designed by ferroelectric nano-metamaterials
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DOI：
10.1016/j.actamat.2016.05.006
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发表时间：
2016-07
期刊：
影响因子：
9.4
通讯作者：
L. Lich;T. Shimada;Shahmohammadi Sepideh;Jie Wang;T. Kitamura
中科院分区：
文献类型：
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作者：
L. Lich;T. Shimada;Shahmohammadi Sepideh;Jie Wang;T. Kitamura
超材料的最新进展提供了一条有前途的途径，可以通过合理设计的构建块来有效地定制和设计各种材料特性。为了进一步利用超材料概念的机电特性，我们使用基于金兹堡-朗道理论的相场模型研究铁电纳米超材料中的机电响应。在铁电纳米超材料中获得了广泛的表观压电系数，其强烈依赖于内部结构，这表明铁电纳米超材料在调节压电性方面具有很强的多功能性。在铁电纳米超材料中可以实现不寻常的正横向压电系数，从而实现正压电各向异性。这些不寻常的系数超出了均质铁电体中通常出现的系数。我们进一步介绍并演示了压电环形的新功能，它代表了铁电纳米超材料中出现的铁环形有序和机械激发之间的新型机电耦合。因此，本研究通过将超材料概念进一步扩展到机电纳米超材料，通过有意控制铁电纳米超材料的内部结构，为机电性能的定制和设计提供了令人兴奋的机会。
The recent advance in metamaterials provides a promising route to efficiently tailor and design a variety of material properties through rationally engineered building blocks. To further exploit the metamaterial concept with respect to electromechanical properties, we investigate electromechanical responses in ferroelectric nano-metamaterials using a phase field model based on Ginzburg-Landau theory. A wide magnitude range for apparent piezoelectric coefficients, which are strongly dependent on the internal structure, are obtained in ferroelectric nano-metamaterials, manifesting ferroelectric nano-metamaterials possess great versatility for tailoring the piezoelectricity. Unusual positive transverse piezoelectric coefficients, and consequently positive piezoelectric anisotropy can be achieved in ferroelectric nano-metamaterials. These unusual coefficients go beyond those which typically occur in homogenous ferroelectrics. We further introduce and demonstrate a new functionality of piezotoroidicity, which represents a new type of electromechanical coupling between ferrotoroidic ordering and mechanical excitation, emerging in ferroelectric nano-metamaterials. The present study thus opens exciting opportunities for the tailoring and design of electromechanical properties through deliberate control of the internal structure of ferroelectric nano-metamaterials by further extension of the metamaterial concept to electromechanical nano-metamaterials.