Time Dependency of Vibration Observables in Single-frequency AFM Operations (Accepted)


Yılmaz Ç.

19th International Nanoscience and Nanotechnology Conference (NanoTR-19), Middle East Technical University, Ankara, Turkey, 27 - 29 August 2025, pp.1, (Summary Text)

  • Publication Type: Conference Paper / Summary Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.1
  • Akdeniz University Affiliated: Yes

Abstract

Driving the micro-cantilever at the resonance frequency enhances sensitivity to tip-sample interaction forces in single-frequency AFM. Oscillation observables of AFM micro-cantilevers to Van der Waals forces vary with time at particular separation distances. Correspondingly, quantification of sensitivity to Van der Waals forces strongly depends on the selected time periods, which can be simply extracted from forced displacements. In the present study, oscillatory motions of the AFM micro-cantilevers with different elastic stiffness, effective masses, and tip radii are obtained for the fundamental eigenmode in monomodal operations using the lumped parameter model. It is observed that amplitude, phase shift, and frequency responses mostly exhibit similar behaviors in the time domain (19.0 – 19.4 ms) for different mechanical features of the micro-cantilever. The responses of the dynamic model are compared with the results in the literature, which are determined for an AFM micro-cantilever under different operating conditions. For instance, the amplitude of 9.05 nm at 19.02 ms and the phase shift of around 96 degrees at 19.08 ms are closer to the literature results, which are the amplitude of 9.9 nm and the phase shift of 90 degrees in the separation distance range of 1 - 5 nm, respectively. Therefore, the time dependency of vibration observables of micro-cantilevers under external forces is to be considered for enhanced sensitivity analysis.