Magnetic Force (MFM) Imaging
MFM Using Interleave Scanning and LiftMode
230
MultiMode SPM Instruction Manual
Rev. B
Figure 13.2c
Cantilever Tune for Amplitude Detection
Figure 13.2d
Shift in amplitude at
fi
xed drive frequency
4. Adjust the
Drive Amplitude
so that the RMS voltage response of the photodetector is
approximately 2V. (Somewhat larger values may be beneficial if using amplitude detection.)
This can be done with
Auto Tun
e by selecting an appropriate
Target Amplitude
(in this
case, 2V) before tuning, or by exiting
Cantilever Tune
and manually adjusting the
Drive
Amplitude
parameter under
Feedback Controls
.
5.
Quit
Cantilever Tune
and return to
Image Mode
.
6. Under
Interleave Controls
set the
Lift start height
to
0nm
, and
Lift scan height
to
100nm
.
(The lift height can be optimized later.) Set the remaining
Interleave
parameters (
Setpoint
,
Drive Amplitude,
Drive frequency
, and gains) to the
Main Controls
values. This can be
done by setting the flags left of the
Interleave Control
column to “off” (grayed bullets).
7. Under
Scan Controls
, set the
Scan size
to
5µm
and
Scan rate
to
1–2 Hz
.
8. Set the
Channel 1
Data type
to
Height
, the
Data scale
to
75 nm
, the
Line direction
to
Retrace
, and the
Scan line
to
Main
.
036
Drive Frequency
Amplitude
∆
F
0
