Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Scanning Probe Techniques: Method development

O 64.6: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG3

Comparison of the signal-to-noise ratio of the first two flexural modes for qPlus AFM sensors — •Dominik Kirpal and Franz Gießibl — Universität Regensburg

Higher flexural modes are used due to their higher eigenfrequencies and spring constants. In this work we calculated theoretically and determined experimentally the sensitivity for the first two flexural modes of qPlus sensor [1,2]. We found that the sensitivity of the second mode is about 3 times higher than of the first mode. This affects the detector, oscillator and thermal noise [3]. At low temperatures the detector noise is dominant, in ambient conditions and liquid environments thermal and oscillator noise are substantial [4]. The influences of these noise contributions are discussed depending on the experimental setup.

[1] Giessibl, Applied Physics Letters, 76, 1470 (2000).

[2] Ooe et al., arXiv preprint:1605.06584 (2016).

[3] Giessibl et al., Physical Review B, 84, 125409 (2011).

[4] Wutscher, and Franz J. Giessibl, Review of Scientific Instruments 82.9 (2011): 093703.

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