Simultaneous Measurement of Film Deformation and Friction Force During Shearing of Molecularly Thin Lubricants
Simultaneous Measurement of Film Deformation and Friction Force During Shearing of Molecularly Thin Lubricants
复制标题
同时测量薄分子润滑剂剪切过程中的油膜变形和摩擦力
DOI：
10.1109/tmag.2012.2197600
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发表时间：
2012
影响因子：
2.1
通讯作者：
H. Zhang
中科院分区：
文献类型：
--
作者：
Y. Kajihara;K. Fukuzawa;S. Itoh;R. Watanabe;H. Zhang
采用两级成像椭偏显微镜（TIEM）结合光纤摩擦力测量方法，对润滑油膜的剪切变形进行了测量。TIEM能够在剪切过程中对纳米厚润滑膜的厚度分布进行高横向分辨率和实时测量。通过增加一个中继透镜照明系统和一个大功率LED光源的TIEM，厚度分辨率为0.14 nm的实现。使用该装置的实验结果表明，探针振荡的异步分量，这是由探针和润滑剂或磁盘之间的摩擦力引起的，对应于在硬盘驱动器的磁头-磁盘界面的声发射雪崩，可以发生在探针与润滑剂膜接触时。剪切润滑剂膜的补充的时间常数为数百微秒的量级，这比扩散现象的时间尺度短得多。
The shearing deformation of the lubricant film was measured by using two-stage imaging ellipsometric microscope (TIEM) combined with an optical-fiber-based friction force measurement method. The TIEM enables high-lateral-resolution and real-time measurements of the thickness distribution of the nanometer-thick lubricant films during shearing. By adding a relay lenses illumination system and a high-power LED light source to the TIEM, a thickness resolution of 0.14 nm was achieved. The results of an experiment using this apparatus demonstrated that the asynchronous component of the probe oscillation, which is induced by friction force between the probe and lubricant or disk and corresponds to acoustic emission avalanches in the head-disk interface of hard disk drives, can occur when the probe is in contact with the lubricant film. The time constant of replenishment of the sheared lubricant film was of the order of hundreds of microseconds, which is much shorter than the timescale of diffusion phenomena.