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DY: Fachverband Dynamik und Statistische Physik

DY 24: Poster I

DY 24.26: Poster

Wednesday, March 28, 2007, 16:00–18:00, Poster D

Experiments on a Ferrofluidic Torsional Pendulum Suspended in an Oscillating Magnetic Field — •Harald Brendel, Reinhard Richter, and Ingo Rehberg — Experimentalphysik 5, Universität Bayreuth, D-95444 Bayreuth

Recently a new type of torsional pendulum was proposed (M.I. Shliomis, M.A. Zaks, Phys. Rev. E, vol.73, 066208 (2006)) which we realize by suspending a DISC SHAPED container in a Helmoltz pair of coils driven by an alternating sinusodial current. In contrast to a spherical pendulum the orientation of the disc is expected to be sensitive to the field direction: It exposes its edge to the stationary oscillating magnetic field and its broad side to the field of high frequency. Increasing the field amplitude the state of rest gives way to oscillations near the equilibrium. Further growth of the driving amplitude is predicted to give rise to rotational motion. We study the scenarios for the case of magnetic fluids of different composition.