Effects of Nonlinear Forces on Dynamic Mode Atomic Force Microscopy and Spectroscopy
Abstract:In this paper, we describe the effects of nonlinear tip–sample forces on dynamic mode atomic force microscopy and spectroscopy. The jumps and hysteresis observed in the vibration amplitude (A) versus tip–sample distance (h) curves have been traced to bistability in the resonance curve. A numerical analysis of the basic dynamic equation was used to explain the hysteresis in the experimental curve. It has been found that the location of the hysteresis in the A–h curve depends on the frequency of the forced oscillation relative to the natural frequency of the cantilever.
Document Type: Research Article
Publication date: June 1, 2007
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