Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.69: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Vortex pinning at individual defects in magnetic nanodisks — •Michael Rahm1, Josef Biberger1, Vladimir Umansky2, and Dieter Weiss1 — 1Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, D-93040 Regensburg, Germany — 2Braun Center for Submicron Research, Weizmann Institut, Rehovot 76100, Israel
Micro-Hall magnetometry allows to probe the hysteresis trace of individual nanoparticles by measuring the Hall voltage generated by the particle’s stray field in a two-dimensional electron gas. We studied the interaction between magnetic vortices and artificial point defects by using micro-Hall magnetometry. Disk-shaped permalloy particles with diameters between 300 and 800 nm and thicknesses from 20 to 60 nm, which contain a single lithographically defined defect, were examined. Magnetization reversal curves were measured for different in-plane directions of the applied field. The data indicate that the magnetic vortex structure can be pinned at the point defect.