Saturday, April 5, 2008

MOKE: Images of Micromagnets

A way to illustrate the magnetic field on surfeces, the Magneto-Optic Kerr Effect can be used. During my time at the Max-Plank-Institute for Microstructure Physics, Halle, I established an experiment to record movies of the domain structure magnitisation of certain material.

The first video clip shows the process of establishing domain structures by exposing the target to a time-variant magnetic field. Here the target was a Whisker. The lumminance of the target corresponds directly to the magntic field strength. The images captured have been overlayed in software by vectors of the magnetic flux direction.

In this second clip the target was a cupper sheet. Contrary to the Whisker we observe a different domain pattern (a stacked one compared to the Landau-Lifshitz structure before). Furthermore defects in the target material lead to earlier domain forming.

The Project Report and a Poster are unfortunatly available in German only.


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