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随着硬盘(HDDs)面记录密度的增加,读写数据时磁头的飞行高度不断降低。磁头与磁片表面液体润滑膜的接触,会在表面形成半月板,或润滑剂回升,造成润滑剂转移。观测液体润滑膜的转移过程以及其在磁头上的动态变化特性,是研究润滑剂性能的重要方面。改进基于垂直物镜的椭圆偏振显微镜(VEM),提出一种旋转起偏器的方法获得膜厚与被测光强的线性关系,实现磁头表面润滑膜动态观察,并对现有显微镜尤其是照明系统进行改进。实验以非极性全氟聚醚(PFPE)润滑剂Z03覆盖的磁头为样品对椭圆偏振显微镜进行标定。以极性PFPE润滑剂Zdol4000作为样品,对其在磁头表面的去湿现象进行观察。结果证明显微镜横向分辨力约0.36μm。该方法可用于纳米级液体薄膜的可视化观测。
As hard disk (HDDs) surface recording density increases, the head flying height decreases while reading and writing data. Magnetic head and the surface of the film contact with the liquid film, the formation of the meniscus in the surface, or lubricant recovery, resulting in lubricant transfer. Observing the transfer process of a liquid lubricant film and its dynamic behavior in a magnetic head are important aspects for studying lubricant properties. An improved ellipse polarization microscope (VEM) based on vertical objective lens is proposed. A method of rotating the polarizer is proposed to obtain the linear relationship between the film thickness and the measured light intensity. The dynamic observation of the lubricant film on the surface of the head is achieved. The existing microscope, especially the illumination system Improve. Experiment The head covered with non-polar perfluoropolyether (PFPE) lubricant Z03 was used as the sample to calibrate the elliptical polarization microscope. Polarized PFPE lubricant Zdol4000 was used as a sample to observe its dehumidification on the head surface. The results show that the microscope horizontal resolution of about 0.36μm. The method can be used for visual observation of nanoscale liquid films.