A quasi-dynamic adhesion model is used to calculate the intermolecular adhesion forces present in ultra low flying Head Disk Interfaces (HDI’s). The model is a continuum-based micromechanics model that accounts for realistic surfaces with roughness, molecularly thin lubricants, and is valid under both static and dynamic sliding conditions. Several different levels of surface roughness are investigated ranging from extremely smooth surfaces having a standard deviation of surface heights σ=2 Å to rougher interfaces with several nanometer roughness. It is found that when the flying-height is greater than 5 nm, there are no significant adhesive forces, whereas for flying-heights less than 5 nm, adhesion forces increase sharply, which can be catastrophic to the reliability of low flying HDI’s. In addition to roughness, the apparent area of contact between the flying recording slider and the magnetic disk is also found to significantly affect the magnitude of the adhesion forces. The adhesion model is validated by direct comparisons with adhesion “pull-off” force measurements performed using an Atomic Force Microscope with controlled probe tip areas and magnetic disks having different lubricant thickness.
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e-mail: polycarp@uiuc.edu
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April 2004
Technical Papers
Adhesion Forces for Sub-10 nm Flying-Height Magnetic Storage Head Disk Interfaces
Sung-Chang Lee,
Sung-Chang Lee
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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Andreas A. Polycarpou
e-mail: polycarp@uiuc.edu
Andreas A. Polycarpou
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Search for other works by this author on:
Sung-Chang Lee
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Andreas A. Polycarpou
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
e-mail: polycarp@uiuc.edu
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division February 11, 2003; revised manuscript received September 16, 2003. Associate Editor: C.-P. R. Ku.
J. Tribol. Apr 2004, 126(2): 334-341 (8 pages)
Published Online: April 19, 2004
Article history
Received:
February 11, 2003
Revised:
September 16, 2003
Online:
April 19, 2004
Citation
Lee , S., and Polycarpou, A. A. (April 19, 2004). "Adhesion Forces for Sub-10 nm Flying-Height Magnetic Storage Head Disk Interfaces ." ASME. J. Tribol. April 2004; 126(2): 334–341. https://doi.org/10.1115/1.1645299
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