Differentiating Ferroelectric and Nonferroelectric Electromechanical Effects with Scanning Probe Microscopy
Differentiating Ferroelectric and Nonferroelectric Electromechanical Effects with Scanning Probe Microscopy
复制标题
使用扫描探针显微镜区分铁电和非铁电机电效应
DOI：
10.1021/acsnano.5b02227
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发表时间：
2015-06-01
期刊：
影响因子：
17.1
通讯作者：
Kalinin, Sergei V.
中科院分区：
文献类型：
--
作者：
Balke, Nina;Maksymovych, Petro;Kalinin, Sergei V.
在过去的几十年里，功能材料中的铁电性仍然是现代科学中最令人着迷的领域之一。在过去的几年中，快速发展的压电响应力显微镜（PFM）和光谱揭示了机电磁滞回线和偏压诱导的剩余极性状态的存在下，在各种各样的材料，包括许多无机氧化物，聚合物和生物系统。在许多情况下，这种行为被解释为系统铁电性质的充分证据。在这里，我们系统地分析了铁电和非铁电材料的PFM响应，并证明了与铁电性无关的机制可以通过电荷注入和尖端上的静电力来诱导铁电性。我们将专注于各种PFM测量特性的相似性和差异，以提供区分铁电材料特性和电荷注入的实验指南。最后，我们将开发的测量协议应用到一个未知的铁电材料。
Ferroelectricity in functional materials remains one of the most fascinating areas of modern science in the past several decades. In the last several years, the rapid development of piezoresponse force microscopy (PFM) and spectroscopy revealed the presence of electromechanical hysteresis loops and bias-induced remnant polar states in a broad variety of materials including many inorganic oxides, polymers, and biosystems. In many cases, this behavior was interpreted as the ample evidence for ferroelectric nature of the system. Here, we systematically analyze PFM responses on ferroelectric and nonferroelectric materials and demonstrate that mechanisms unrelated to ferroelectricity can induce ferroelectric-like characteristics through charge injection and electrostatic forces on the tip. We will focus on similarities and differences in various PFM measurement characteristics to provide an experimental guideline to differentiate between ferroelectric material properties and charge injection. In the end, we apply the developed measurement protocols to an unknown ferroelectric material.