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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.114: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Traveling patterns in rotating magnetic fields — •Katharina Schatz, Robert Krauss, Reinhard Richter, and Ingo Rehberg — Experimentalphysik 5, Universität Bayreuth, D-95440 Bayreuth, Germany

Recently we have demonstrated, that a magnetic field rotating on the free surface of a ferrofluid layer can induce considerable fluid motion towards the direction the field is rolling. This effect can be utilized for a magnetic pump, which can drive a flow even in small geometries, where a mechanical driving of the flow is not possible. In our contribution we demonstrate that the pump is still working if a constant magnetic field is superimposed on the rotating one. This enables us to drive a periodic pattern of Rosensweig peaks by means of a rotating field. The traveling velocity of the pattern is measured for different values of the rotation amplitude and frequency.

[1] Robert Krauß, Bert Reimann, Reinhard Richter, and Ingo Rehberg, Appl. Phys. Lett. 86 024102-1 (2005).