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Investigation of the Mechanics of Nanocontacts Using a Vibrating Cantilever Technique
Abstract A vibrating cantilever technique is presented, which allows the continuous measurement of the tip-sample interaction force F int(z) in the contact as well as in the non-contact region as a function of the tip-sample distance z. The method relies on the measurement of the frequency difference Δf = f — f0 between the eigenfrequency f 0 of the free cantilever and the actual resonance frequency f of the cantilever, which is influenced by the tip-sample interaction potential. From such frequency shift data, F int(z) can be reconstructed, as we will demonstrate with the example of a silicon tip vibrating near a graphite surface. The resulting F int(z)-curves are subsequently used to extract parameters like the adhesion force F ad or the point of contact Z c . A detailed comparison with suitable model interactions additionally opens an elegant way to investigate the mechanics of the nanocontact, which behaves in good approximation as expected from the so-called Hertz-plus-offset model.
Investigation of the Mechanics of Nanocontacts Using a Vibrating Cantilever Technique
Abstract A vibrating cantilever technique is presented, which allows the continuous measurement of the tip-sample interaction force F int(z) in the contact as well as in the non-contact region as a function of the tip-sample distance z. The method relies on the measurement of the frequency difference Δf = f — f0 between the eigenfrequency f 0 of the free cantilever and the actual resonance frequency f of the cantilever, which is influenced by the tip-sample interaction potential. From such frequency shift data, F int(z) can be reconstructed, as we will demonstrate with the example of a silicon tip vibrating near a graphite surface. The resulting F int(z)-curves are subsequently used to extract parameters like the adhesion force F ad or the point of contact Z c . A detailed comparison with suitable model interactions additionally opens an elegant way to investigate the mechanics of the nanocontact, which behaves in good approximation as expected from the so-called Hertz-plus-offset model.
Investigation of the Mechanics of Nanocontacts Using a Vibrating Cantilever Technique
Schwarz, U. D. (Autor:in) / Hölscher, H. (Autor:in) / Allers, W. (Autor:in) / Schwarz, A. (Autor:in) / Wiesendanger, R. (Autor:in)
01.01.2001
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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