Instruction manual

Electric Force (EFM) Imaging

Electric Field Gradient Detection—Preparation

252 MultiMode SPM Instruction Manual Rev. B

Voltage Applied to the Tip

Notice that the jumper conﬁguration in Figure 14.3h connects the Analog 2 signal from the

NanoScope III controller (± 12 VDC range) to the tip, and is exactly the same as the jumper

conﬁguration shown in Figure 14.3g, the standard conﬁguration as shipped from the factory.

Note: In all conﬁgurations which apply voltage to the tip, an E-ﬁeld 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-deﬁned. Return to the main Feedback Controls panel; the Analog 2

ﬁeld should now be enabled. This signiﬁes that voltage is now being supplied via the “Analog 2”

pin located on the MultiMode baseplate header.

Remember to restore (Allow in attenuation) upon completion of EFM imaging.

Figure 14.3h Jumper conﬁguration for application of voltage to tip

(for systems with the Basic Extender Module).

Sample

Tip

Analog 2

Ground

Analog 2

Unused

Auxiliary D (to NanoScope III controller)

To AFM Tip

Indicates jumpers

Analog 2

STM

Piezo Cap