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Head-disk interface dynamic instability due to intermolecular forces

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2 Author(s)
Thornton, B.H. ; Dept. of Mech. Eng., Univ. of California, Berkeley, CA, USA ; Bogy, D.B.

This paper presents a nonlinear dynamic analysis of the head-disk interface for sub- 5 nm flying air bearing sliders. It is found that by including intermolecular forces between the slider and disk, the dynamic stability of the slider is dramatically compromised. It is shown by a bifurcation diagram that a slider can easily be forced into unstable motions. It is also shown that the experimentally observed flying-height hysteresis, intermittent instability, and "snapping" from stable to unstable proximity can be explained by intermolecular forces.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )