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Theoretical Model for Lubricant Pick-Up (Breakage of Liquid Meniscus Bridge Due to Elongation in Bridged Direction)

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3 Author(s)
Matsuoka, H. ; Dept. of Mech. & Aerosp. Eng., Tottori Univ., Tottori, Japan ; Kan-Nen, M. ; FUKUI, S.

In recent magnetic storage systems, the spacing between the flying head and the disk has been drastically decreased to less than 5 nm in order to realize ultra-high density recording. Lubricant on the disk is picked up on the flying head slider as a result of the intermittent contact between the slider and the disk, or due to condensation of the lubricant vapor. In this study, the basic characteristics of lubricant pick-up caused by the breakage of a liquid meniscus bridge are investigated theoretically. A model for the breakage of a liquid meniscus bridge is proposed and the volume fraction of the lubricant pick-up is derived. The effects of the radius of curvature of a sphere surface and the initial volume of a liquid droplet on the volume fraction of the lubricant pick-up are discussed. The theoretical results obtained from a model that the authors proposed showed good agreement with the experimental results. This model is considered to be useful in the prediction of lubricant pick-up characteristics.

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Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 10 )