Regensburg 2010 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Spatially Extended Dynamical Systems

DY 29.5: Talk

Thursday, March 25, 2010, 15:00–15:15, H46

Magnetic stripe-forcing of an experiment with broken up-down symmetry — •Thomas Friedrich, Ingo Rehberg, and Reinhard Richter — Experimentalphysik 5, Universität Bayreuth

Historically, a spatial forcing was first studied experimentally in electroconvection [1]. More recently, [2] measured inclined layer convection under the influence of lamellar surface corrugations. In both experiments, the first convection pattern beyond a threshold are stripes. What has not been measured so far, is the impact of stripe-forcing on a system with a primary instability to hexagons. The Rosensweig instability in a layer of ferrofluid, is a system with broken up-down symmetry [3] [4]. Consequently its first pattern is a hexagonal one. We apply for the first time a static magnetic stripe-forcing to the Rosensweig instability, and record the response by means of X-rays. The outcome is compared to results, obtained by amplitude equations[5].

[1] M. Lowe, J. Gollub, and T. Lubensky, Phys. Rev. Lett., 51(9):786–789, 1983

[2] G. Seiden, S. Weiss, J. H. McCoy, W. Pesch, and E. Bodenschatz, Phys. Rev. Lett., 101(21):214503, 2008.

[3] M. D. Cowley and R. E. Rosensweig, J. Fluid Mech.,30:671, 1967.

[4] R. Richter, Physik Journal, 7:39–44, 2008.

[5] R. Peter, et al., Phys. Rev. E, 71(4):046212, 2005.