Dissipation Imaging with Low Amplitude off-Resonance Atomic Force Microscopy

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概要

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• 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) $7\times 7$ 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.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2005-07-15

著者

• Norris Andrew

  SFI Trinity Nanoscience Laboratory, Trinity College Dublin, Dublin 2, Ireland

• Özer H.

  SFI Trinity Nanoscience Laboratory, Trinity College Dublin, Dublin 2, Ireland

• Ozer H.

  SFI Trinity Nanoscience Laboratory, Trinity College Dublin, Dublin 2, Ireland

• Sader John

  Department of Mathematics and Statistics, University of Melbourne, Victoria 3010, Australia

• Pethica John

  SFI Trinity Nanoscience Laboratory, Trinity College Dublin, Dublin 2, Ireland

関連論文

• Dissipation Imaging with Low Amplitude off-Resonance Atomic Force Microscopy

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