Instruction manual

Magnetic Force (MFM) Imaging

MFM Using Interleave Scanning and LiftMode

230 MultiMode SPM Instruction Manual Rev. B

Figure 13.2c Cantilever Tune for Amplitude Detection

Figure 13.2d Shift in amplitude at ﬁxed drive frequency

4. Adjust the Drive Amplitude so that the RMS voltage response of the photodetector is

approximately 2V. (Somewhat larger values may be beneficial if using amplitude detection.)

This can be done with Auto Tune by selecting an appropriate Target Amplitude (in this

case, 2V) before tuning, or by exiting Cantilever Tune and manually adjusting the Drive

Amplitude parameter under Feedback Controls.

5. Quit Cantilever Tune and return to Image Mode.

6. Under Interleave Controls set the Lift start height to 0nm, and Lift scan height to 100nm.

(The lift height can be optimized later.) Set the remaining Interleave parameters (Setpoint,

Drive Amplitude, Drive frequency, and gains) to the Main Controls values. This can be

done by setting the flags left of the Interleave Control column to “off” (grayed bullets).

7. Under Scan Controls, set the Scan size to 5µm and Scan rate to 1–2 Hz.

8. Set the Channel 1 Data type to Height, the Data scale to 75 nm, the Line direction to

Retrace, and the Scan line to Main.

036

Drive Frequency

Amplitude

∆F