Abstract
We analyze the dynamics of an atomic force microscopy (AFM) cantilever oscillating in liquid at subnanometer amplitude in the presence of tip-sample interaction. We present AFM measurements of oscillatory solvation forces for octamethylcyclotetrasiloxane on highly oriented pyrolitic graphite and compare them to a harmonic oscillator model that incorporates the effect of the finite driving force for a typical AFM configuration with acoustic driving. In contrast to the general belief, we find—in both experiments and modeling—that the tip-sample interaction gives rise to a pronounced signature in the phase at driving frequencies well below resonance.
Original language | English |
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Article number | 253106 |
Number of pages | 3 |
Journal | Applied physics letters |
Volume | 93 |
Issue number | 25 |
DOIs | |
Publication status | Published - 2008 |
Keywords
- METIS-252392
- IR-73457