Electric Techniques
Electric Force Microscopy
Rev. D
Dimension 3100 Manual
291
16.2.4 Phase Detection
Phase Detection is only available when the Extender Electronics Module has been correctly
configured into the system.
1. In the
Auto Tune
Controls
window, set
Start frequency
and
End frequency
to appropriate
values for your cantilever (e.g., for 225µm MFM cantilevers, set
Start frequency
to 40kHz
and
End frequency
to 100 kHz).
2. Select
Auto Tune
.
Note:
Two curves appear on the Cantilever Tune graph (see
amplitude
curve in white (the solid line in
), and the
phase
curve in
yellow (the dashed line).
Figure 16.2o
Phase Detection Cantilever Tune
(Extender Electronics Module Installed)
Note:
The phase should decrease with increasing frequency and cross the center line
(0° point) at the peak frequency. The phase curve then correctly reflects the
phase lag between the drive and the cantilever response. Gradients in the
electric force cause a shift
∆
F
0
in the resonance frequency. Resonance shifts
also give rise to phase shifts
∆φ
used to generate an image of the electric force
.
Figure 16.2p
Shift In Phase at Fixed Drive Frequency
Frequency Sweep
∆φ
Drive Frequency
90
0
180
Phase (deg)
∆
F
0
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