Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.36: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Detection of magneitc vortex core switching by MOKE Microscopy — •Georg Dieterle1, Joachim Gräfe1, Matthias Noske1, Ajay Gangwar1,2, Johannes Förster1, Markus Weigand1, Hermann Stoll1, Georg Woltersdorf3, Christian H. Back2, and Gisela Schütz1 — 1Max Planck Institute for Intelligent Systems, Stuttgart, Germany — 2Department of Physics, University of Regensburg, Regensburg, Germany — 3Department of Physics, Martin Luther University Halle, Halle, Germany
Experimental detection of the switching of the magnetic vortex core, 10 - 20 nm in diameter, so far requires instrumentations like synchrotron based X-ray microscopes. Here we show how vortex core switching can be detected by a table top MOKE microscope in combination with a sophisticated lock-in technique. In that way vortex core reversal can be measured in about 2 minutes by switching the vortex core about 2000 times per second and averaging the Kerr Signal for vortex core up and vortex core down. In addition our technique enables the determination of switching probabilities during the measurement by performing a continuous calibration of the 100 % switching probabilities. For that purpose an excitation sequence is applied in which, in addition to the excitation to be investigated, excitations known for 100% vortex core reversal, are added. Experimental data will be demonstrated for vortex core reversal by excitation of the vortex core gyromode with in-plane rotating fields. The vortex core will be switched up and down using varying amplitudes and frequencies of the excitation field.