Linear stability analysis of gas-lubricated slider in magnetic recording system with ultra-thin spacing

Cheng I. Weng, Jang I. Lue, Wang Long Li

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The dynamics of a magnetic head flying above a rotating disk with a flying height of the order of one sub-micron or less are discussed. The generalized gas molecular lubrication equation, with roughness and rarefaction effects taken into account, and the equations of motion of the magnetic head are solved simultaneously in the linear stability regime. As the coefficients of the dynamic system are time varying, the nonlinear algebraic equation for the characteristic frequency in the Laplace transform domain is solved iteratively. The stability boundaries are obtained for various roughness parameters (Peklenik number, γ, and standard deviations of composite roughness height, Λb) and operating parameters (modified bearing number, Λb). It is shown that there exists a critical bearing number for a certain moment of inertia/mass ratio of the slider. It is also shown that the slider can fly at a lower height and is more stable when either transversely oriented roughness or a low disk velocity is utilized. A design procedure for stable head-disk operating conditions is also proposed.

Original languageEnglish
Pages (from-to)1757-1769
Number of pages13
JournalJournal of Physics D: Applied Physics
Volume31
Issue number14
DOIs
Publication statusPublished - 1998 Jul 21

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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