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Domain wall study in Permalloy thin layer with polarised neutrons
A single domain wall is created in a Permalloy film of macroscopic dimensions parallel to the surface by sending a current through the foil. With additional fields parallel to the film surface the position of the wall in the depth could be varied. Using 3-dimensional neutron polarisation analysis the properties of this wall were studied, under which the thickness of this wall, the thickness as function of the depth of the wall in the film, the chirality and structure of left and right handed parts of the wall. By comparing simulations of the polarisation matrix using different wall structures the Bloch model could be verifiedsupported. The reversal of chirality was studied as function of a field parallel and anti-parallel to the magnetisation in the centre of the wall. A model was made about this reversal by nucleation that fits the observation.
Physics HS2, Garching, Deutschland
Dr. M.T. Rekveldt, RID, Technical University Delft