UNIMO Technology UDR-204 Manual de instrucciones descargar pdf (Pagina 251)

Magnetic Force (MFM) Imaging

MFM Using Interleave Scanning and LiftMode

Rev. B MultiMode SPM Instruction Manual 231

9. Engage the AFM and make the necessary adjustments to obtain a good topographical image

while displaying height data. Use the highest possible Setpoint to ensure that the tip is

contacting the surface only lightly. The image should be similar to the topographic image

shown on the left of Figure 13.2e. The surface is fairly flat with lubrication nodules of

various sizes. A good image of the nodules indicates that the tip is sharp.

Figure 13.2e Topographic (left) and magnetic force gradient image (right) of metal evaporated tape at 100nm

Lift scan height

Note: The MFM data displays in Channel 2; however, the parameter settings are

different depending on whether Phase Detection or Amplitude Detection is

being used

Phase Detection

Set the Channel 2 image Data type to Phase, Data Scale to 3 degrees, and Line direction to

Retrace.

Note: It is important that the Scan direction be set to Retrace for both the main and

interleave scans. If instead it is set instead to Trace, a band may appear along

the left side of the images due to the time taken for the tip to move between the

surface and the lift scan height.

• Amplitude Detection: Set the Channel 2 image Data type to Amplitude, Data Scale to

1 nm, and Line direction to Retrace.

Change Interleave mode to Lift to invoke LiftMode. Set the Channel 2 Scan line to Interleave to

display the interleaved data. This can only be done after Interleave mode is enabled (set to a

selection other than None.) A magnetic force gradient image similar to that shown on the right of

Figure 13.2e should appear as the Channel 2 image. The alternating dark and light stripes represent

the recorded magnetic information, and signify a varying resonant frequency and hence magnetic

force gradient on the tip. As usual, keep the Setpoint as large as possible while consistent with a

good image. Wider scans (> 25µm) will reveal separate tracks in which the magnetic stripes are at

different angles.

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UNIMO Technology UDR-204 Manual de instrucciones Pagina 251