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Intermolecular force and surface roughness models for air bearing simulations for sub-5 nm flying height sliders

  • Du ChenEmail author
  • David B. Bogy
Technical Paper

Abstract

When the spacing between the slider and the disk is less than 5 nm, the intermolecular forces between the two solid surfaces can no longer be assumed to be zero. The model proposed by Wu and Bogy (ASME J Trib 124:562–567, 2002) can be view as a flat slider–disk intermolecular force model. The contact distance between the slider and disk needs to be considered in this model when the slider-disk spacing is in the contact regime. To get more accurate intermolecular force effects on the head disk interface, the slider and disk surface roughness need to be considered, when the flying height is comparable to the surface RMS roughness value or when contact occurs. With the intermolecular force model and asperity model implemented in the CML air bearing program, the effect of intermolecular adhesion stress on the slider at low flying height is analyzed in the static flying simulation. It is found that the intermolecular adhesion stress between the slider and the disk has slight effect on the slider-disk interface for a flying slider.

Keywords

Asperity Contact Flying Height Disk Interface Head Disk Interface Adhesion Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research was supported by the Information Storage Industry Consortium (INSIC), the Computer Mechanics Laboratory (CML) at the University of California at Berkeley, and the National Science Foundation under Grant CMS-0408484.

References

  1. Chang WR, Etsion I, Bogy DB (1987) An elastic-plastic model for the contact of rough surfaces. ASME J Trib 109:257–263Google Scholar
  2. Chang WR, Etsion I, Bogy DB (1988) Adhesion model for metallic rough surface. ASME J Trib 110:50–56CrossRefGoogle Scholar
  3. Derjaguin BV, Muller VM, Toporov YP (1975) Effect of contact deformations on the adhesion of particles. J Colloid Interface Sci 53:314–326CrossRefGoogle Scholar
  4. Dugdale DS (1960) Yielding in steel sheets containing slits. J Mech Phys Solids 8:100–104CrossRefGoogle Scholar
  5. Greenwood JA, Williamson JBP (1966) Contact of nominally flat surfaces. Proc R Soc Lond A295:300–319Google Scholar
  6. Gupta V, Bogy DB (2006) Effect of intermolecular forces on the static and dynamic performance of air bearing sliders: part I—effect of initial excitations and slider form factor on the stability. ASME J Trib 128:197–202CrossRefGoogle Scholar
  7. Israelachvili JN (1992) Intermolecular and surface forces, 2nd edn. Academic, San DiegoGoogle Scholar
  8. Johnson KL, Kendall K, Roberts AD (1971) Surface energy and the contact of elastic solids. Proc R Soc Lond A324:301–313Google Scholar
  9. Kogut L, Etsion I (2003a) A finite element based elastic-plastic model for the contact of rough surfaces. Trib Trans 46:383–390CrossRefGoogle Scholar
  10. Kogut L, Etsion I, (2003b) Adhesion in elastic-plastic spherical microcontact. J Colloid Interface Sci 261:372–378CrossRefGoogle Scholar
  11. Maugis D (1992) The JKR-DMT transition using a dugdale model. J Colloid Interface Sci 150:243–269CrossRefGoogle Scholar
  12. Muller VM, Derjaguin BV, Toporov VP (1983) On two methods of calculation of the force of sticking of an elastic sphere to a rigid plane. Colloid Surfaces 7:251–259CrossRefGoogle Scholar
  13. Ostrovskaya LY (2003) Studies of diamond and diamond-like film surfaces using XAES, AFM and wetting. Vacuum 68:219–238CrossRefGoogle Scholar
  14. Suh AY, Polycarpou AA (2005) Adhesive contact modeling for sub-5 nm ultralow flying magnetic storage head-disk interfaces including roughness effects. J Appl Phys 97:104328–104338CrossRefGoogle Scholar
  15. Tabor D (1977) Surface forces and surface interactions. J Colloid Interface Sci 58:1–13CrossRefGoogle Scholar
  16. Wu L, Bogy DB (2002) Effect of the intermolecular forces on the flying attitude of sub-5 nm flying height air bearing sliders in hard disk drives. ASME J Trib 124:562–567CrossRefGoogle Scholar
  17. Yu N, Polycarpou AA (2004) Adhesive contact based on the Lennard-Jones potential: a correction to the value of the equilibrium distance as used in the potential. J Colloid Interface Sci 278:428–435CrossRefGoogle Scholar
  18. Zhang B, Nakajima A (2003) Possibility of surface force effect in slider air bearings of 100 Gbit/in2 hard disks. Tribol Int 36:291–296CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Computer Mechanics Laboratory, Department of Mechanical EngineeringUniversity of California at BerkeleyBerkeleyUSA

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