Signal processing for probe storage

Abstract

Scanning-probe data storage is emerging as a viable alternative to conventional data storage offering ultra-high density, low access-times, and low power consumption. One probe-storage technique utilizes thermomechanical means to store and retrieve information in thin polymer films. In this paper we describe the readback signal path and characterize the thermomechanical-based probe-storage recording channel. It is shown that this channel exhibits a particular nonlinear behavior at high storage densities or high recording power that is, the energy per unit time used to write a bit of information. A simple model is proposed that accurately captures the characteristics of this nonlinearity. Experimental results from single-probe recording setups are used throughout the paper to verify the validity of this model and identify its relevant parameters. © 2005 IEEE.