Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.59: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Simulation of ultrafast dynamics in all optical pump probe experiments on nanoscale Permalloy elements — •G. Eilers and M. Münzenberg — IV. Phys. Inst., Universität Göttingen

Nano-size ferromagnetic structures are of strong interest for future high speed magnetic random access memory and ultra high density magnetic storage. Magnetic precession Eigen modes depending on the length/width ratio of rectangular nanostructures of Permalloy are studied using the Landau-Lifshitz-Gilbert equation. Aim is to investigate the limits of precessional switching speed in the limit of smallest sized elements.

Demagnetization effects observed in all optical pump probe experiments with ultrafast Ti:Sapphire lasers still lacks the theoretical background: electrons are excitated by a pump laser pulse and a subsequent demagnetization of the spin system in the order of 5% is observed. We used a demagnetization effect of a laser spot in between 5 to 100 % in lateral ferromagnetic thin films and nanostructured rectangular ferromagnetic elements in our simulations. Magnetization dynamics in the ps to ns range is compared to precession modes observed in all optical pump probe experiments. For the simulation the oommf micromagnetic simulation tool is used.