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Rev. D Dimension 3100 Manual 195
Chapter 12 Lateral Force Mode
This chapter includes the following sections:
Introduction: Section 12.1
Basic LFM Operation: Section 12.2
Advanced LFM Operation: Section 12.3
Scan Direction: Section 12.3.1
Tip selection: Section 12.3.2
Understanding the LFM Signal: Section 12.3.3
Understanding the Color Scale: Section 12.3.4
Using TMR Voltage to Measure Friction: Section 12.3.5
Enhancing the LFM Data by Subtracting Two Images: Section 12.3.6
Height Artifacts in the Signal: Section 12.3.7
12.1 Introduction
The Dimension 3100 SPM is capable of measuring frictional forces on the surfaces of samples
using a special measurement known as lateral force microscopy (LFM). The name derives from the
fact that cantilevers scanning laterally (perpendicular to their lengths) are torqued more as they
transit high-friction sites; low-friction sites tend to torque cantilevers less. The relative measure of
lateral forces encountered along a surface yields a map of high- and low-friction sites.
After obtaining a good topographical image in Contact mode, it is relatively easy to use LFM to
view and acquire lateral force data. It is important to obtain a good image in Contact mode before
measuring LFM data. The NanoScope system will continue to run the feedback based on measuring
the vertical deflection signal and feedback gains in the control panel while LFM data is acquired
and displayed.
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