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Switching probabilities of magnetic vortex core reversal studied by table top magneto optic Kerr microscopy

Dieterle, G. ; Gangwar, A. ; Gräfe, J. ; Noske, M. ; Förster, J. ; Woltersdorf, G. ; Stoll, H. ; Back, C. H. ; Schütz, G.


We have studied vortex core reversal in a single submicron Permalloy disk by polar Kerr microscopy. A sophisticated lock-in-technique based on repetitive switching of the magnetic vortex core and a continuous calibration allows for a reliable determination of the switching probability. This highly sensitive method facilitates the detection of a change in the magnetic moment of the tiny magnetic ...


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