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Magnetic Force Microscopy
Basic MFM Operation
Rev. D Dimension 3100 Manual 259
15.2.2 Magnetic Force Microscopy Procedure
1. Magnetize a NanoProbe magnetic probe with a strong permanent magnet before installing
the tip holder on the AFM head.
Note: Tips are usually magnetized with the field aligned along the tip axis
(perpendicular to the sample surface). The MFM then senses force gradients
due to the perpendicular component of the samples’s stray field. Tip
magnetizers can be purchased from Veeco.
2. Mount a NanoProbe magnetic probe on the scanner or tip holder.
3. Set up the AFM for TappingMode operation (see Chapter 9).
4. In all Channel panels, set the Highpass and Lowpass filters to Off.
5. Set the Rounding parameter in the Microscope > Calibrate > Scanner window to zero (0).
6. Tune the cantilever drive frequency.
Note: The procedure to tune the cantilever drive amplitude depends on whether you
are using phase detection or amplitude detection. Both cases rely on automatic
Cantilever tune just as when preparing for TappingMode (see Chapter 9).
MFM cantilevers have resonant frequencies between 50 and 100 kHz. If using
the AutoTune feature, these values can be used as bounds for the frequency
sweep. With the Extender option, two curves appear in the Cantilever Tune
box: the amplitude curve in white, and the phase curve in yellow (see Figure
15.2a). Microscopes without the Extender Electronics Module display only the
amplitude curve.
Setting a Drive Frequency for Phase Detection
The Drive frequency should be set to the center of the cantilever resonance, as shown in Figure
15.2a. This occurs automatically if using AutoTune.
Figure 15.2a Cantilever Tune for Phase Detection and Frequency Modulation
007
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