Surface potential of ferroelectric thin films investigated by scanning probe microscopy
Surface potential of ferroelectric thin films investigated by scanning probe microscopy
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DOI：
10.1116/1.590851
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发表时间：
1999-09-01
影响因子：
1.4
通讯作者：
Weiss, PS
中科院分区：
文献类型：
--
作者：
Chen, XQ;Yamada, H;Weiss, PS
利用扫描探针显微镜，通过在镀金悬臂梁和导电衬底之间施加电压，以接触方式在铁电薄膜中形成局部极化畴。描述了两种可视化极化区域的方法。第一种是通过在探针尖端和衬底之间施加小的振荡电压来检测膜的压电响应。该测量直接确定了局部铁电极性和畴结构。第二种方法是使用扫描麦克斯韦应力显微镜测量极化膜的表面电势。这并不直接解决薄膜的铁电行为，而是由于表面电荷的电位。我们确定了表面电位对施加到铁电体的脉冲电压和持续时间的依赖性。结果表明，随着脉冲电压和脉冲持续时间的增加，表面电位的变化面积迅速增大，但表面电位趋于饱和。由此产生的稳定的局部表面电荷的功能表明，锆钛酸铅薄膜是有前途的高密度电荷存储介质的候选人。(C)1999年美国真空学会。[S0734-211X（99）02405-1]。
Scanning probe microscopy was used to form local polarized domains in ferroelectric thin films by applying a voltage between the gold-coated cantilever and the conductive substrate in contact mode. Two methods of visualizing the poled areas are described. The first is to detect the piezoelectric response of the films by applying a small oscillating voltage between the probe tip and the substrate. This measurement determines the local ferroelectric polarity and domain structure directly. The second method is to measure the surface potential of the poled films using scanning Maxwell stress microscopy. This does not directly address the ferroelectric behavior of the film, but rather the potential due to surface charge. We determined the surface potential dependence on pulse voltage and duration applied to the ferroelectric him. The results demonstrate that the changed area will increase rapidly, but the surface potential will saturate as the pulse voltage and duration an increased. The resultant stable localized surface charge features indicate that lead zirconate titanate thin films are promising candidates for high-density charge storage media. (C) 1999 American Vacuum Society. [S0734-211X(99)02405-1].