Veeco Dimension 3100, Manual

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Interleave Scanning
Use of LiftMode with TappingMode
Rev. D Dimension 3100 Manual 251
Note that certain constraints are imposed: scan sizes, offsets, angles, and rates and numbers of
samples per scan line are the same for the main and interleave data, and the imaging context
(contact, TappingMode, or force modulation) must also match.
3. Choose the Interleave Data Type : Depending on the type of microscope, Interleave mode
allows the options of amplitude, phase, frequency, potential, input potential, or data types for
doing far-field (MFM or EFM) imaging; see
Chapter 15 for detailed examples. Auxiliary
channels are also available for some applications.
Once the Interleave Data Type is chosen, Interleave mode is automatically enabled, triggering
interleave scanning. Interleave data typically displays as the second (right) image. Note that the
scan rate in the slow direction is halved.
4. Display the interleave data by switching Scan line (in the Channel panels) to Interleave .
• Lift scan height : The lateral and vertical resolutions of the Lift data depend on the
distance between tip and sample: the lower the tip, the higher the resolution. However,
the
Lift scan height must be high enough that the tip does not contact the sample during
the Lift trace and retrace.
• Tip Shape : As shown in Figure 14.3a , the tip separation in the LiftMode is defined in
terms of the Z direction only. The Lift scan height is added to the height values taken
from previous scan lines point-by-point. However, the tip may be closer to the sample
than the Z separation indicates. On features with steep edges, the tip may get very close
to the sample even though the Z separation is constant; see
Figure 14.3a .
• Scan Line Direction : The Line direction should be set to Retrace for both the main
and interleaved scans. If it is set instead to Trace, a band may appear along the left side
of the images due to the ramp between the surface and the
Lift scan height .
14.5 Use of LiftMode with TappingMode
There are additional considerations when using LiftMode with TappingMode.
14.5.1 Main Drive Amplitude and Frequency selection
As usual, these parameters are set in Cantilever Tune before engaging. It is helpful to keep in mind
the measurements to be done in
LiftMode when setting these values. For example, if Amplitude
data will be monitored during the Lift scan for magnetic force imaging, the Drive frequency
should be set to the side of the resonance; see Chapter 15 . (However, certain parameters can be set
independently for the interleave scan; see below.)