Based on the concept that the FH of a portion of the slider that carries the read/write element can be adjusted by a piezoelectric actuator and the FH can be measured according to the magnetic signal, a new 3-DOF analytic model and an observer-based nonlinear compensator are proposed to achieve ultra-low FH with minimum modulation under short range attractive forces. Numerical simulations show that the FHM due to disk waviness is effectively reduced with a control voltage of less than ±2V.
Nonlinear Compensator Design of Active Proximity Sliders for Head-Disk Spacing Variation Suppression in 3-nm Air Bearings
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Juang, J, & Bogy, DB. "Nonlinear Compensator Design of Active Proximity Sliders for Head-Disk Spacing Variation Suppression in 3-nm Air Bearings." Proceedings of the ASME 2004 3rd Integrated Nanosystems Conference. Design, Synthesis, and Applications. Pasadena, California, USA. September 22–24, 2004. pp. 49-50. ASME. https://doi.org/10.1115/NANO2004-46081
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