Mechanical Engineering Faculty Research

Title

Molecular Dynamics Simulation of Amplitude Modulation Atomic Force Microscopy

Document Type

Article

Publication Date

Summer 6-12-2015

Abstract

Molecular dynamics (MD) simulations were used to model amplitude modulation atomic force microscopy (AM-AFM). In this novel simulation, the model AFM tip responds to both tip–substrate interactions and to a sinusoidal excitation signal. The amplitude and phase shift of the tip oscillation observed in the simulation and their variation with tip–sample distance were found to be consistent with previously reported trends from experiments and theory. These simulation results were also fit to an expression enabling estimation of the energy dissipation, which was found to be smaller than that in a corresponding experiment. The difference was analyzed in terms of the effects of tip size and substrate thickness. Development of this model is the first step toward using MD to gain insight into the atomic-scale phenomena that occur during an AM-AFM measurement.

Publication Title

Nanotechnology

Volume

26

Issue

23

First Page

235705

Last Page

235705