Dresden 2009 – wissenschaftliches Programm
CPP 12.5: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Column formation in magnetic granular matter — •Sebastian Lehmann, Ingo Rehberg, Thomas Fischer, and Reinhard Richter — Experimentalphysik V, Universität Bayreuth,
Inspired by the Rosensweig Instability occuring in magnetic fluids, we are investigating a related pattern forming mechanism in magnetic granular matter. A monolayer of magnetizable spheres rearranges itself to columns of spheres under increase of the magnetic field. The latter is created by a Helmholtz pair of coils. We measure the heights of the columns as a function of the applied field and compare it with different models, using the energy of the different configurations as a basis of the computation.