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Head–disk spacing of hard disk drives was measured based on Michelson interferometry using white light illumination. This method utilizes the phase comparison of two interference fringe patterns formed respectively on the inner surface of a glass disk and the air bearing surface of a slider through the glass disk. To suppress interference noise and to further enhance measurement accuracy, low coherent...
Functional perfluoropolyether (PFPE) films consisting of mobile and bonded molecules are widely used for lubrication of magnetic disks. In order to clarify the influence of film composition (mobile/bonded) on tribological performance, we measured the friction properties of two types of 2 nm-thick PFPE films (functional Zdol2000 and nonfunctional Z03) under lightly loaded (loading force: 0–1 mN) and...
This paper presents measurement of head flying height in hard disk drives using phase comparison Michelson interferometry (PCMI). To suppress interference noise and to further enhance measurement accuracy, low coherent white light was adopted as an illumination source to replace high coherent laser. The captured images and the measured results indicate that the application of white light illumination...
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