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 13.100: Poster

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

Dynamics of ferromagnetic nanomagnets with vortex or single-domain configuration — •Rainer Höllinger, Andreas Killinger, and Uwe Krey — Inst. Physik II, Univ. Regensburg

We study the dynamics of flat circular permalloy (Py) nanomagnets for 1.) magnetic vortex and 2.) single-domain configurations, using micromagnetic simulation.

Ad 1.): Dynamical studies for isolated vortex structures show that both the vorticity, and the polarity of the out-of-plane component can be switched fast (50-100 ps). However, the stability and dynamics of arrays of such nanostructures may differ from the behaviour of the single unit.

Ad 2.): Micromagnetic simulations of the switching process in thin cylindrical Py nanoparticles with an initial stable single-domain state show nearly homogeneous single-domain behaviour followed by excitation of spin waves.