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Magnetic Force Microscopy
Advanced MFM Operation
266 Dimension 3100 Manual Rev. D
image. It is usually safe to increase the Drive Amplitude until the first signs of tip strike
are noticed, then reduce the amplitude slightly.
Before enabling the Interleave Drive Amplitude, check that its value is not much larger
than the main Drive Amplitude value. This prevents the cantilever oscillation from
jumping to a very large amplitude when the parameter is enabled, possibly damaging
the tip. The Drive Amplitude can be adjusted even when the parameter is disabled
(i.e., when the flag is set to Off [gray bullet]).
•When using Amplitude Detection, variations in Drive Amplitude affect sensitivity and
image contrast as well as signal-to-noise ratio. This is because changes in the oscillation
amplitude change the slope of the amplitude vs. frequency curve, and hence the
effective sensitivity; see Figure 15.3b. With phase detection and frequency modulation,
changes in amplitude produce no change in contrast, and results are thus more
reproducible than with amplitude detection.
Note: On some microscope models, there is a lowpass filter in the scanning
electronics that prevents fast switching of the Drive Amplitude between main
and Interleave scanning. This can interfere with very fast rates (> a few Hz).
The filter can be disabled easily; contact Veeco technical support for more
information.
CAUTION: Before enabling the Interleave Drive Amplitude, check that its
value is not much larger than the main Drive Amplitude value to
prevent possible damage to the tip.
ATTENTION: Lors d’un travail enmode intercalé (Interleave Mode) vérifier que
la valeur de tension appliquée à l’oscillateur piézo-électrique est
inférieure à celle appliquée à l’oscillateur en mode imagerie (Main
Drive Amplitude). Le non respect de cette procédure peut entraîner
la destruction de la pointe.
VORSICHT: Um mögliche Beschädigung der Meßspitze zu vermeiden,
vergewissern Sie sich, daß der Wert der Interleave Drive Amplitude
nicht wesentlich größer ist, als der Main Drive Amplitude, ehe Sie
den Interleave Mode aktivieren.
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