Agilent Technologies E5500 Series User's Guide Page 123

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Additional Imaging Modes 7
Agilent 5500 SPM User’s Guide 123
Lateral Force Microscopy (LFM)
Lateral Force Microscopy is a derivative of Contact Mode. During a
typical scan, the cantilever twists in the scan direction as well as
deflecting in the vertical axis. The detector senses change in the
cantilever‘s twisting motion and outputs it as the lateral deflection
(Friction) signal.
Changes in lateral force on the tip can be caused either by changes in
frictional properties across the sample or by variations in topography.
The Friction signal will therefore be a convolution of these two
components. To differentiate friction from topography, two LFM
images are typically captured side-by-side. One image is constructed
from the Friction signal during each trace of the raster scan, and the
other from the Friction signal during retrace. One image can then be
inverted and subtracted from the other to reduce the topographic
artifacts, leaving primarily the effects of friction.
To image in LFM Mode, follow the procedure for Contact Mode given
in Chapter 5. In the Realtime Images window, choose to display two
Friction images, selecting Trace for one and Retrace for the other
(Figure 87).
Figure 87 Display Trace and Retrace Friction images
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