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Lubricant transfer or pickup from a disk to a head slider is a crucial issue in designing the head–disk interfaces of hard disk drives (HDDs). A method based on ellipsometric microscopy is presented for observing thin lubricant film on a head slider in real time. The use of rotating-compensator ellipsometry (RCE) results in one order of magnitude higher temporal resolution (0.6 frames/s) and several...
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