Multiple Slips in Atomic-Scale Friction: An Indicator for the Lateral Contact Damping
Multiple Slips in Atomic-Scale Friction: An Indicator for the Lateral Contact Damping
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DOI：
10.1007/s11249-009-9567-7
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发表时间：
2010-07-01
影响因子：
3.2
通讯作者：
Meyer, Ernst
中科院分区：
文献类型：
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作者：
Roth, Raphael;Glatzel, Thilo;Meyer, Ernst
二维原子级摩擦测量中多次跳跃的发生用于量化与 NaCl(001) 表面接触的尖锐尖端的粘滑运动所伴随的粘性阻尼。对于 13 至 91 nN 之间的法向力，观察到多次滑动，但没有明显磨损。对于平行于[100]方向的扫描，尖端以之字形方式在基底波纹电势的最小值之间跳跃。应用算法来确定表征多次滑动的侧向力跳跃的直方图。使用相同的算法对计算的侧向力图中发生的多次滑动进行分类。模拟与实验之间的比较表明，纳米尺寸接触在中等载荷 (13-26 nN) 下阻尼不足，在较高载荷下变得稍微过阻尼。所提出的程序是一种估计横向接触阻尼的新颖方法，它在解释摩擦的速度和温度依赖性、滑动持续时间以及通过施加垂直或平行振荡减少摩擦的测量中发挥着重要作用。
The occurrence of multiple jumps in 2D atomic-scale friction measurements is used to quantify the viscous damping accompanying the stick-slip motion of a sharp tip in contact with a NaCl(001) surface. Multiple slips are observed without apparent wear for normal forces between 13 and 91 nN. For scans parallel to [100] directions, the tip jumps between minima of the substrate corrugation potential in a zigzag fashion. An algorithm is applied to determine histograms of lateral force jumps which characterize multiple slips. The same algorithm is used to classify multiple slips occurring in calculated lateral force maps. Comparisons between simulations and experiments indicate that the nanometer-sized contact is underdamped at intermediate loads (13-26 nN) and becomes slightly overdamped at higher loads. The proposed procedure is a novel way to estimate the lateral contact damping which plays an important role in the interpretation of measurements of the velocity and temperature dependence of friction, of slip duration, and of the reduction of friction by applied perpendicular or parallel oscillations.