Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.46: Poster
Dienstag, 1. April 2014, 13:00–15:30, P1
Stroboscopic wide-field Kerr-microscopy on soft magnetic ribbons — •Christian Becker1,2, Rudolf Schäfer1, and Ludwig Schultz1,2 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden — 2Technische Universität Dresden, Institute for Materials Science, 01062 Dresden
Applied especially as cores in generators, motors or transformers soft magnetic materials are magnetized alternately in time. The observation of magnetic domains in a time-resolved way is of great interest if the excitation frequency exceeds the maximum resolution of the eye. A Kerr-microscopic setup using a strobed LED is presented. Wide-field imaging of magnetic domains in a time-resolved way during periodic magnetic excitation is thereby possible. MOKE hysteresis loops are obtained from the images by plotting the average gray value as a function of magnetic field. Quasistatic magnetization processes differ from those under dynamic excitation conditions. MOKE hysteresis loops on bulk magnetic ribbons exhibit a broadening with increasing frequency as also observed by inductive measurements. We compare the inductively measured loops, which contain information of the whole sample volume, with the optical measured loops sensitive only to the surface magnetization. To ribbons in the as-cast amorphous state as well as to annealed with induced surface crystallization. The dynamic behavior of the magnetic microstructure in cycling field and quasistatic magnetization processes is discussed.