Mechanism of Velocity Saturation of Atomic Friction Force and Dynamic Superlubricity at Torsional Resonance
Mechanism of Velocity Saturation of Atomic Friction Force and Dynamic Superlubricity at Torsional Resonance
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DOI：
10.1143/jjap.46.5591
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发表时间：
2007-08
影响因子：
1.5
通讯作者：
M. Igarashi;J. Nakamura;A. Natori
中科院分区：
文献类型：
--
作者：
M. Igarashi;J. Nakamura;A. Natori
我们研究了两种机制的扫描速度饱和的平均摩擦力的摩擦力显微镜和共振减少的平均摩擦力通过叠加在悬臂梁上的一维汤姆林森模型的基础上，在有限的温度。速度饱和是由尖端的高度滑移运动的出现引起的，这是由增加扫描速度引起的。我们提出了两种可能的机制，即增强的同步滑移运动的针尖原子与支撑点和激活滑移运动的针尖原子的振荡激发引起的平均摩擦力的共振减少。计算结果与实验结果吻合较好。
We studied both mechanisms of the scan velocity saturation of the average friction force of friction force microscopy and the resonant reduction in the average friction force by superimposing torsional oscillation on a cantilever on the basis of the one-dimensional Tomlinson model at a finite temperature. The velocity saturation is caused by the appearance of a high degree of slip motion for a tip, which is induced by increasing the scan velocity. We proposed two possible mechanisms for the resonant reduction in the average friction force, namely, the enhanced synchronous slip motion of a tip atom with a support point and the activated slip motion of a tip atom caused by oscillation excitation at a stick point. The calculated results reproduce the experimental results well.