Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15707
Title: Design, modeling and optimization of head-disk systems with extremely small head-disk spacing
Authors: LI HUI
Keywords: magnetic data storage, magnetic disk drive, head-disk interface, tribology, slider technology, intermolecular force
Issue Date: 13-Jan-2007
Source: LI HUI (2007-01-13). Design, modeling and optimization of head-disk systems with extremely small head-disk spacing. ScholarBank@NUS Repository.
Abstract: This thesis explores understanding and solutions for achieving highly stable head-disk interface for ultra-high density magnetic recording. Investigations include intermolecular force effects, nano-meter and sub-nanometer surface roughness and its effects on interface stability, the thermally induced nano-deformation and the corresponding instability of head-disk interface in both conventional recording systems and future heat assisted magnetic recording (HAMR) systems. A self-developed design and simulation tool was developed. The effects of intermolecular force on slidersa?? flying attitude were investigated numerically. A roughness probability model was built to describe the roughness of slider air bearing surface and disk surface. The Reynolds equation was modified by the average thin-film theory based on the probability model. The heat transferring between slider and disk surfaces was modeled and numerically simulated based on an unstructured adaptive triangular mesh method and the Voronoi polygons control volume method. Finally, new interface technologies for achieving high interface stability at ultra-low fly-height were also investigated. A multi-shallow step structure was proposed for achieving a stable nanometer spaced head-disk interface by reducing the intermolecular force and forces ratio of intermolecular force to air bearing force acting on the slidera??s top trailing pad.
URI: http://scholarbank.nus.edu.sg/handle/10635/15707
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