Cypher SPM
User Guide
spot.
Figure 4.3: By turning the focus offset knob, it is possible to focus on optical image on the sample
while the laser stays focused on the cantilever.
24.2 Tuning the cantilever for AC imaging
1.
Initiate cantilever tune:
l
Select the tune tab in the master panel.
l
Set the four auto tune parameters (Low, High, Amplitude, Percent) as shown to the right.
l
Click the Auto Tune button.
2.
Observe tune result:
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A graph will pop up with the tune result.
l
The resonance curve should peak around 300kHz.
l
The relevant results are automatically stored. After inspecting that the amplitude and phase
curves look “clean”, you can close the graph.
HINT
Cleaner tunes can be obtained by blowing the cantilever holder with clean compressed air prior
to loading cantilever to get rid of any left over silicon/glass debris.
3.
Set scan parameters:
l
Click the Main tab on the Master Panel .
l
Set the set point value to 700mV, the second item highlighted in yellow in
l
Check that all the other values and check boxes of your Main tab panel are the same as
24 Engaging the cantilever on the sample
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