Velocity Dependence and Limitations of Friction Force Microscopy of Mica and Graphite
We investigate the behavior of a friction force microscope tip on a crystal at tip velocities above 1 µm/s. Cleaved mica and highly oriented pyrolytic graphite (HOPG) are observed by a friction force microscope in ambient operation. A regular saw-toothed signal corresponding to atomic-level stick-sl...
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Published in | Japanese Journal of Applied Physics Vol. 39; no. 6S; pp. 3804 - 3807 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
2000
|
Online Access | Get full text |
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Summary: | We investigate the behavior of a friction force microscope tip
on a crystal at tip velocities above 1 µm/s.
Cleaved mica and highly oriented pyrolytic
graphite (HOPG) are observed by a friction force microscope
in ambient operation.
A regular saw-toothed signal corresponding to atomic-level stick-slip
is observed in each case at tip velocities lower than 1.5 µm/s.
However,
in the case of observing mica at tip velocities above 1.5 µm/s,
regularity of the signal becomes unstable.
Sometimes no saw-toothed signal is observed
and even if there were a saw-toothed signal,
the pitch of the saw-toothed signal would be larger
than that corresponding to the crystal structure.
In the case of observing HOPG,
clear regularity is detected at tip velocities above 20 µm/s.
The difference is considered to be caused
by the hydrophilic/hydrophobic property of each crystal.
For HOPG,
the mechanical property of the cantilever is the limitation.
For a 200-µm-long and 20-µm-wide rectangular cantilever,
95 kHz and 417 kHz spectrums,
corresponding to the natural frequency of the cantilever
for deflection and torsion with the tip in contact,
start to mask the stick-slip signal as the scanning velocity is increased. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0021-4922 1347-4065 |
DOI: | 10.1143/JJAP.39.3804 |