Reduction of flying height modulation of hybrid active slider — A nonlinear control approach

This paper is concerned with the issue of reduction of fly height vibration (modulation) associated with hybrid active slider which is driven by both thermal and piezoelectric actuators. Since the accurate system parameters are hard to obtain, a Lyapunov based nonlinear control approach is proposed to control the fly height modulation after a simplified system model is proposed. The controller only requires the bounds of the estimation errors of the selected system parameters and the feedback of selected system states, is thus simple in structure and efficient in real time application. The proof and verification of the effectiveness of proposed approach to reduce the fly height modulation is given.