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Anomalous polarization inversion in ferroelectrics via scanning force microscopy

机译：铁电异常极化反演的扫描力显微镜

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摘要

Local poling of ferroelectrics by the sharp conducting tip of a scanning force microscope (SFM) is studied experimentally and theoretically. The formation of the inverse domain under the SFM tip, where the polarization is oriented in the direction opposite to that of the poling field, is reported for bulk ferroelectrics (single crystals of solid solutions PbZn_(1/3)Nb_(2/3)O_3-PbTiO_3). This finding confirms earlier results on ferroelectric thick films, thus proving the universality of the anomalous polarization inversion in ferroelectric media. It is shown that the inverse domain grows with the increase of the poling voltage and duration and remains stable for a long time after the removal of electric field. The growth process is described by a dynamic model assuming that the appearance of inverse domains is due to a local internal electric field directed against the poling one. This field is attributed to the space charge formed beneath the SFM tip due to injection of charge carriers and their subsequent drift and trapping. Poling voltage and poling time dependences of the domain size are correctly described by the model. Implications of the anomalous polarization inversion for the domain engineering and dense data storage in ferroelectrics are discussed.
机译：实验和理论上研究了由扫描力显微镜（SFM）的尖锐导电尖端对铁电材料进行的局部极化。据报道，对于块状铁电体（固溶体单晶体PbZn_（1/3）Nb_（2/3），在SFM尖端下方形成反畴，其极化方向与极化场相反。 O_3-PbTiO_3）。这一发现证实了在铁电厚膜上的早期结果，从而证明了铁电介质中反常极化反转的普遍性。结果表明，反域随极化电压和极化时间的增加而增长，并且在去除电场后很长时间内保持稳定。假设逆域的出现是由于指向极化场的局部内部电场导致的，则通过动态模型来描述生长过程。该场归因于由于电荷载流子的注入以及随后的漂移和俘获而在SFM尖端下方形成的空间电荷。模型正确描述了极化电压和极化时间与域大小的关系。讨论了极化异常反演对铁电领域工程和密集数据存储的影响。

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