I am trying to perform same experiment on my magnetic nanoparticles, but found some uncommon results in scanning in different directions. scanning from right to left and from left to right, we see a change in contrast of image, i.e. black and white. It seems like a shadow that appears all the time on all our particles. Can I ask how should I manage to solve the issue. more generally is it an artifact or this has a meaning and should be interpreted?
Did you calculate the interaction field between tip and sample? Is this large enough to switch your nanoparticles ?
Maybe not necessarily switching but just rotation of nanoparticles - if they are free to move, naturally. Recall that MFM is Magnetic Force Microscopy.
in any case, it would help to also have the topography, to map the phase shift (BTW, is that already phase shift, or absolute phase?) to the height features, and better check if that is just an edge effect (probably artifact only) or something also associated with inner area position.
In simple words: what you see is a microscopic picture of magnetization process, like the one when you magnetize a needle with permanent magnet moving nearby, with MFM tip playing the role of permanent magnet.
well, it is not always like that, that you magnetize the particles in the sample just by passing by with your little magnet in the tip. There may be also particles magnetic by themselves, either because are permanent magnets, or because they are in turn magnetized by another external applied magnetic field. What is more tricky, is to understand the effect of magnetic interaction force depending on the orientations of magnetization: will that be zero, at 90deg, between field of tip and field of particles?
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