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RESEARCH PAPERS: Heat Transfer in Manufacturing

Marangoni Mechanism in Pulsed Laser Texturing of Magnetic Disk Substrates

[+] Author and Article Information
T. D. Bennett, C. P. Grigoropoulos

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

D. J. Krajnovich, P. Baumgart, A. C. Tam

IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120

J. Heat Transfer 119(3), 589-596 (Aug 01, 1997) (8 pages) doi:10.1115/1.2824146 History: Received January 18, 1996; Revised April 01, 1997; Online December 05, 2007

Abstract

This paper proposes a mechanism for topographical features formed during pulsed laser texturing of Ni-P magnetic disk substrates. A salient feature of the process is the ability to raise a central peak in the irradiated spot, providing a low contact area bearing for the slider-head of a computer hard drive. Formation of topography is believed to involve gradient capillary forces acting at the surface of the molten pool (Marangoni effect). However, the central peak cannot be explained with thermo-capillary forces alone. Therefore, it is suggested that a compositional gradient due to the depletion of a surfactant at the molten surface provides the necessary condition to reverse the capillary force in the central region. This perspective is investigated using finite element modeling of the Lagrangian fluid mechanics coupled with heat and mass diffusion.

Copyright © 1997 by The American Society of Mechanical Engineers
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