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MA: Magnetismus

MA 6: Magnetische Partikel / Cluster

MA 6.12: Vortrag

Montag, 8. März 2004, 18:00–18:15, H10

Remagnetization dynamics in Permalloy microparticles observed on the nanosecond time scale. — •Andrew Kuksov¹, Aleksander Krasyuk², Andreas Oelsner², Daniel Neeb², Gerd Schoenhense², and Claus Schneider³ — ¹IFW, Helmholz str.20, 01069 Dresden — ²Universitat Mainz, Staudingerweg 7, 55128 Mainz — ³Forschungszentrum Juelich Institut fur Festkoerperforschung, D-52425 Juelich

We have investigated the time evolution of the magnetization distribution in Permalloy microparticles with time-resolved X-Ray Photo Emission Electron Microscopy. The stroboscopic pump-probe experiments with sub-nanosecond time resolution have been carried out at the synchrotron facilities BESSY II and ESRF using soft X-ray magnetic circular dichroism as magnetic contrast mechanism. The particles had a thickness of 30 nm and the following shapes with linear dimensions of 40 micrometers: rings, squares and diamonds (square rotated by 45 degree). As the static domain patterns are dominated by the shape anisotropy, the local magnetization M has well-defined directions (parallel, antiparallel, orthogonal, 45 degree) with respect to the external magnetic field H generated by a current pulse through the micro stripline. Depending on the orientation between M and H the magnetization dynamics varies significantly. The best time resolution achieved in these measurements was in the range of 130ps.