| Autor: |
Zypman, Fredy |
| Předmět: |
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| Zdroj: |
Journal of Vacuum Science & Technology: Part B-Nanotechnology & Microelectronics; May2010, Vol. 28 Issue 3, pC4E24-C4E27, 1p, 1 Diagram, 1 Chart, 3 Graphs |
| Abstrakt: |
In this article the authors build a practical modification to the standard Euler–Bernoulli equation for flexural modes of cantilever vibrations relevant for operation of noncontact atomic force microscopy in high vacuum conditions. This is done by first introducing an internal dissipation based on basic physical grounds. Second, this dissipation is written explicitly for the case of a cantilever in terms of the flexural deflection. Third, the equation is used to simulate the response of a free-end atomic force microscopy cantilever under harmonic excitation. Finally, this theoretical signal is compared to corresponding extant high vacuum experiments. They demonstrate that a single parameter is enough to reproduce the first two experimental flexural resonances. For comparison, they also show that the standard dissipation term proportional to the velocity, cannot fit the two peaks with a single parameter. They argue that the new term introduced here has a mesoscopic origin in the relative angular motion between consecutive layers inside the cantilever. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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