Accurate formula for conversion of tunneling current in dynamic atomic force spectroscopy
- Creators
-
Sader, John E.
- Sugimoto, Yoshiaki
Abstract
Recent developments in frequency modulation atomic force microscopy enable simultaneous measurement of frequency shift and time-averaged tunneling current. Determination of the interaction force is facilitated using an analytical formula, valid for arbitrary oscillation amplitudes [Sader and Jarvis, Appl. Phys. Lett. 84, 1801 (2004)]. Here we present the complementary formula for evaluation of the instantaneous tunneling current from the time-averaged tunneling current. This simple and accurate formula is valid for any oscillation amplitude and current law. The resulting theoretical framework allows for simultaneous measurement of the instantaneous tunneling current and interaction force in dynamic atomic force microscopy.
Copyright and License
© 2010 American Institute of Physics.
Acknowledgement
The authors thank Alexis Baratoff and Shigeki Kawai for interesting discussions on a related problem. J.E.S. acknowledges support from the Australian Research Council Grants Scheme. Y.S. is supported by the Frontier Research Base for Global Young Researchers under the Special Coordination Funds for Promoting Science and Technology of MEXT. Mathematica code for implementing the derived formula is available from the corresponding author J.E.S..
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Additional details
- ISSN
- 1077-3118
- Australian Research Council