Sub-Angstrom oscillation amplitude non-contact atomic force microscopy for lateral force gradient measurement

Date

2009-12-01

Author

Atabak, Mehrdad
Unverdi, Ozhan
Özer, Hakan Özgür
Oral, Ahmet

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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We report the first results from novel sub-Angstrom oscillation amplitude non-contact atomic force microscopy developed for lateral force gradient measurements. Quantitative lateral force gradients between a tungsten tip and Si(1 1 1)-(7 x 7) surface can be measured using this microscope. Simultaneous lateral force gradient and scanning tunnelling microscope images of single and multi atomic steps are obtained. In our measurement, tunnel current is used as feedback. The lateral stiffness contrast has been observed to be 2.5 N/mat single atomic step, in contrast to 13 N/m at multi atomic step on Si(1 1 1) surface. We also carried out a series of lateral stiffness-distance spectroscopy. We observed lateral stiffness-distance curves exhibit sharp increase in the stiffness as the sample is approached towards the surface. We usually observed positive stiffness and sometimes going into slightly negative region.

URI

https://hdl.handle.net/11511/94480

Journal

APPLIED SURFACE SCIENCE

DOI

https://doi.org/10.1016/j.apsusc.2009.10.026

Collections

Department of Physics, Article

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Citation Formats

M. Atabak, O. Unverdi, H. Ö. Özer, and A. Oral, “Sub-Angstrom oscillation amplitude non-contact atomic force microscopy for lateral force gradient measurement,” APPLIED SURFACE SCIENCE, vol. 256, no. 5, pp. 1299–1303, 2009, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/94480.