Dissipation Imaging with Low Amplitude off-Resonance Atomic Force Microscopy

A small amplitude non-contact atomic force microscope/scanning tunnelling microscope (nc-AFM/STM) is used to study dissipative interactions at atomic resolution on Cu(100) and Si(111) surfaces. For Cu(100) atomic resolution images of phase contrast are obtained, showing energy dissipation as high as...

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Published in:Japanese Journal of Applied Physics 2005-07, Vol.44 (7S), p.5325
Main Authors: Özer, H. Özgür, O'Brien, Simon J., Norris, Andrew, Sader, John E., Pethica, John B.
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description A small amplitude non-contact atomic force microscope/scanning tunnelling microscope (nc-AFM/STM) is used to study dissipative interactions at atomic resolution on Cu(100) and Si(111) surfaces. For Cu(100) atomic resolution images of phase contrast are obtained, showing energy dissipation as high as 100 meV/cycle at each atomic site during constant tunnel current scans. In contrast, the Si(111) 7×7 surface usually did not exhibit significant phase contrast during normal STM operating conditions. However, when the driving oscillation frequency was set to a sub-harmonic of the lever resonant frequency, atomic contrast in phase could be readily observed. We believe this harmonic coupling is due to the nonlinearity of the tip-sample interaction, and at these frequencies part of the energy is dissipated via the lever Q.
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title Dissipation Imaging with Low Amplitude off-Resonance Atomic Force Microscopy
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