Lateral Force Mode
Advanced LFM Operation
Rev. B
MultiMode SPM Instruction Manual
169
10.2 Advanced LFM Operation
10.2.1 Scan Direction
The cantilever is most susceptible to frictional effects when the scan direction runs perpendicular to
the major axis of the cantilever as shown in
. The
Scan angle
parameter in the
Scan
Controls
panel must be set to
90°
or
270°
to produce this scan direction.
Figure 10.2a
Scan Angle Selection
The contact mode setpoint voltage will slightly adjust the gain of the lateral force signal. By
increasing the setpoint, the contact force applied will increase, and so will the frictional or torsional
forces in an approximately linear fashion. If the frictional effects are far too large or too small, it
will be necessary to resort to changing the cantilever probe used, but if the value is near the
dynamic range desired, adjustment of the contact force will produce modest changes in the lateral
force or frictional signal.
Scan Direction
for Friction
Measurements
scan angle
90° or 270°
Scan Direction
without Scan
Rotation
scan angle 0°
Cantilever
(Top View)
