Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.63: Poster

Friday, February 29, 2008, 11:15–14:00, Poster E

Non-linear influences of inhomogeneous current distribution on vortex dynamics — •Stellan Bohlens and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg

For the development of new memory devices it is important to investigate the mechanisms of coupling between magnetization and electrical current. The orientation of the local magnetization influences the current flow via the anisotropic magneto resistance (AMR). Vice versa the current influences the magnetization via its Oersted field and the spin-transfer-torque. We investigate the effect of inhomogeneous current distributions on different magnetization patterns by micromagnetic simulations. The mutual influence of inhomogeneous current distribution and magnetization pattern causes non-linear effects. Taking these effects into account interesting deviations occur compared to the homogeneous case. A vortex pattern excited by a homogeneous alternating current performs harmonic oscillations. If inhomogeneous current paths are taken into account the amplitude of the oscillation is strongly enhanced and deviations from the ellipsoidal orbit occur.