Tunneling Current and Surface Potential Simultaneous Measurement Using a Scanning Probe
Tunneling Current and Surface Potential Simultaneous Measurement Using a Scanning Probe
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使用扫描探针同时测量隧道电流和表面电势
DOI：
10.1143/jjap.37.4557
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发表时间：
1998
影响因子：
1.5
通讯作者：
M. Iwamoto
中科院分区：
文献类型：
--
作者：
Y. Majima;S. Miyamoto;Y. Oyama;M. Iwamoto
研制了一种新的隧道电流和表面电位同时测量系统。样品和电化学蚀刻的钨尖端之间的距离（d）以高精度正弦变化。当d变得小到几nm时，隧道电流根据尖端的振动周期性地流动。表面电位是使用开尔文法的原理测量的，在开尔文法中，由于表面电位的存在而产生的位移电流以及尖端和样品之间的电容差的变化被检测到。利用针尖振动的相位差，实现了对隧道电流和位移电流的同时测量。给出了确定齿尖半径和齿尖直径的方法。
A new simultaneous measuring system for tunneling current and surface potential has been developed. The distance (d) between a sample and an electrochemically etched tungsten tip is changed sinusoidally with high precision. The tunneling current flows periodically in accordance with the vibration of the tip when d becomes as small as a few nm. The surface potential is measured using the principle of the Kelvin method in which the displacement current due to the presence of surface potential and the change in capacitance difference between the tip and the sample is detected. Simultaneous measurement of the tunneling current and the displacement current has been attained by utilizing their phase difference in tip vibration. The method for determining the tip radius and d is also presented.