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Switching behavior of single domain particles
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The drawing on the left side shows schematically circular dots produced by lithography on a GaAs substrate. The MFM image on the right side has been taken with an out-of plane magnetized tip. Due to the shape anisotropy of the dots (the diameter is much larger than their height) the magnetization lies in plane. Since their volume is small, they behave as single domain particles. Therefore, each dot is imaged like a small magnet with south and north pole, resulting a strong black and white contrast above the poles.
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