Tracking accuracy and stability of a sliding peak-filter based controller for spiral nanopositioning in probe storage systems

Abstract

High precision nanopositioning is a crucial function of high-density probe-based storage devices and its performance affects determinatively the device's reliability. The use of non-conventional nanopositioning schemes for achieving much higher data rates imposes new requirements on the control algorithms. In this work we analyze in terms of accuracy and stability an H2 controller combined with a sliding peak-filter for moving along an archimedean spiral trajectory. As it is demonstrated, proper selection of the peak-filter parameters results to a stable and accurately controlled system that achieves high positioning velocities and also supports different read and write data rates.