Instruction manual

Electric Force (EFM) Imaging
Electric Field Gradient Detection—Procedures
256 MultiMode SPM Instruction Manual Rev. B
14.4 Electric Field Gradient Detection—Procedures
Note: Amplitude detection is the only procedure described here that can be done
without the Basic Extender Module; however, this method is no longer
recommended (see “Without Basic Extender Module” on page 259).
1. Locate the two toggle switches on the backside of the Basic Extender box (Figure 14.4a),
then verify that they are toggled as shown in Table 14.4a.
Figure 14.4a Toggle Switches on Back of Basic Extender Module
Table 14.4a Basic Extender Module Toggle Switch Settings
Note: The toggle switch combination of Surface Potential = ON and Analog2 = ON is
not recommended and can produce erratic, undefined results.
2. Electrically connect the sample by mounting it to a standard sample disk or stage using
conducting epoxy or silver paint. Ensure the connection is good; a poor connection will
introduce noise.
Mode Tip or Sample Voltage
FM/Phase Surface
Potential
GND/Surface
Potential
Analog 2
TappingMode
Contact AFM
MFM
√ √
Surface
Potential
√ √
Apply voltage
to tip or sam-
ple (Use for
electric field
gradient
imaging; tun-
neling AFM)
√ √
FM/Phase
Surface Potential
Gnd/Surface Potential
Analog 2
Mode
Tip or Sample
Voltage
T
o
NanoScope
To
Microscope