Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Micro and Nanostructured Magnetic Materials II

MA 7.2: Vortrag

Montag, 25. Februar 2008, 15:30–15:45, EB 301

Magnetic ratchet — •Alexander Auge, Alexander Weddemann, and Andreas Hütten — Bielefeld University, Universitätsstr. 25, 33615 Bielefeld

Transport phenomena in spatially periodic magnetic systems far from thermal equillibrium are considered. The emphasis is put on directed transport of magnetic beads in a so called magnetic ratchet (Brownian motor). An asymmetric magnetic potential and Brownian motion of magnetic beads are the basic concepts for a magnetic ratchet. Two main concepts to achieve an asymmetric magnetic potential are considered. On the one hand this is achievable by a gradient in current density, on the other hand asymmetric geometries of magnetic materials can be used.

In this thesis simulations are carried out to find asymmetric magnetic potentials, which can be used for directed transport. Promising simulated geometries are experimentally realised.