Electric Force (EFM) Imaging
Electric Field Gradient Detection—Preparation
246
MultiMode SPM Instruction Manual
Rev. B
14.3.1 Jumper Con
fi
gurations for systems
without
the Basic Extender
Module
As shipped from the factory, the jumper con
fi
guration on a MultiMode SPM
without
the Basic
Extender Module should appear as shown in
below.
Figure 14.3b
Normal Jumper Con
fi
guration
(for systems
without
the Basic Extender Module).
Voltage Applied to the Tip
The jumper con
fi
guration in
connects the Analog 2 signal from the NanoScope III
controller (± 12 VDC range) to the tip.
Note:
In all con
fi
gurations which apply voltage to the tip, an E-
fi
eld cantilever holder
is required. Contact Veeco for more information.
Enabling the Analog 2 Voltage Line
The “Analog 2” voltage line is normally used by the NanoScope to control the attenuation (1x or
8x) of the main feedback signal. This application of EFM imaging uses the Analog 2 signal for
EFM data. Therefore, input attenuation must be disabled for the duration of the EFM experiments.
To do this, select
di
>
Microscope Select
>
Edit
>
Advanced
to display the
Equipment
dialog
box. Set
Analog 2
to
User-de
fi
ned
. Return to the main
Feedback Controls
panel; the
Analog 2
fi
eld should now be enabled. This signi
fi
es that voltage is now being supplied via the “Analog 2”
pin located on the baseplate header.
Remember to restore (
Allow in attenuation
) upon completion of EFM imaging.
Ground
Analog 2
Gain Select
Auxiliary D (to NanoScope III controller)
To AFM Tip
Indicates jumpers
Analog 2
STM
Piezo Cap
