Atomic Force Microscopy

Magnetic Force & Electrostatic Force Microscopy (MFM & EFM)

Hard Disk, topography, image size is 4 x 4 µm2, Z-Range is 10 nm
Hard Disk, topography, image size is 4 x 4 µm2, Z-Range is 10 nm
MFM channel
MFM channel

helps to visualize magnetic properties, if a magnetic stray field is present.

The magnetic forces are measured - mostly in the dynamic mode - using a tip with a magnetic coating.
For the measurement of long range magnetic forces the distance between tip and sample is increased. The magnetic coating of the tip interacts with the magnetic stray field. This interaction influences the amplitude and phase of the oscillation of the cantilever.
MFM channels (phase & amplitude) and topography are acquired simultaneously.

Typical samples are hard disks, metal alloys, magnetic nanoparticles.

Additional long range force interactions can be characterized by:

  • Eddy Current Microscopy (ECM), a non-contact method that allows to explore resistivity variations and
  • Electrostatic Force Microscopy (EFM), which maps localized surface charges in metals and insulators.

 

 

More Information

AFM Techniques