Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 93: Scanning Probe Techniques: Method Development
O 93.9: Vortrag
Donnerstag, 21. März 2024, 17:00–17:15, MA 043
Approaching unstable periodic states in dynamic Atomic Force Microscopy — •Lukas Böttcher1, Hannes Wallner2, Niklas Kruse2, Anna Dittus2, Wolfram Just2, Ingo Barke1, Jens Starke2, and Sylvia Speller1 — 1Institute of Physics, University of Rostock — 2Institute of Mathematics, University of Rostock
Bistable states, caused by the nonlinear tip-sample interaction, are frequently encountered during dynamic Atomic Force Microscopy (AFM) measurements, sometimes leading to characteristic image artifacts. These states are characterized by two stable states, one at low, one at high amplitude, flanking an unstable branch at intermediate amplitudes. This unstable branch is usually not accessible experimentally. Utilizing fast, minimally invasive control schemes we were able to approach such states of instability. The aim is to reveal the whole resonance curve of our cantilever including fold bifurcation points and a cusp, while interacting with the surface. This may bring new insights into AFM as well as in the tip-sample contact.
Keywords: nonlinear; AFM; scanning probe; dynamic; bistability