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首页> 外文期刊>Nanotechnology >Unique nano-domain structures in self-assembled BiFeO3 and Pb(Zr,Ti)O-3 ferroelectric nanocapacitors
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Unique nano-domain structures in self-assembled BiFeO3 and Pb(Zr,Ti)O-3 ferroelectric nanocapacitors

机译：自组装的BiFeO3和Pb（Zr，Ti）O-3铁电纳米电容器中的独特纳米域结构

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摘要

In this work, self-assembled ferroelectric BiFeO3 (BFO) and Pb(Zr,Ti)O-3 (PZT) nanocapacitors were fabricated by a one-step pulsed-laser deposition process. Each individual nanocapacitor consists of a SrRuO3 or LaSrMnO3 bottom electrode layer, an epitaxial ferroelectric middle layer and a self-assembled nanoisland of conductive Bi2O3 or PbO2 as the top nanoelectrode. The nanoelectrodes have a lateral size of 10-100 nm depending on various deposition equivalent thickness. The as-fabricated nanocapacitors exhibit unique so-called anti-domain structures, with opposite polarization orientation to that of the naked ferroelectric films, which can be understood by the different interface built-in-voltages between their neighboring layers. They also show apparent reduced coercive fields and enhanced piezoelectricity compared to the naked films, as revealed by the switching spectroscopy piezoresponse force microscopy (SSPFM) and band-excitation mapping. Besides that, individual addressable polarization writing and erasing properties were also observed in these nanocapacitors and the written domain can maintain stability up to 12 h, which is promising for data storage devices.
机译：在这项工作中，通过一步脉冲激光沉积工艺制备了自组装铁电BiFeO3（BFO）和Pb（Zr，Ti）O-3（PZT）纳米电容器。每个单独的纳米电容器均由SrRuO3或LaSrMnO3底部电极层，外延铁电中间层以及导电Bi2O3或PbO2作为顶部纳米电极的自组装纳米岛组成。根据各种沉积当量厚度，纳米电极的横向尺寸为10-100nm。制成的纳米电容器表现出独特的所谓的反畴结构，其极化取向与裸铁电薄膜的极化取向相反，这可以通过相邻层之间的不同界面内置电压来理解。与裸膜相比，它们还显示出明显降低的矫顽场和增强的压电性，如通过开关光谱压电响应力显微镜（SSPFM）和能带激发图所揭示的。除此之外，在这些纳米电容器中还观察到了单独的可寻址极化写入和擦除特性，并且写入域可以保持长达12 h的稳定性，这对于数据存储设备是有希望的。

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