Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: POSTERS Magnetic Soft Matter

CPP 12.12: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Traveling-stripe forcing of a ferrofluid — •Thomas Friedrich, Reinhard Richter, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth

Transport of a ferrofluid has been achieved by rotating magnetic fields [1]. In contrast, we apply a smooth periodic spatiotemporal modulation of the magnetic induction to a shallow layer of magnetic liquid. In the subcritical regime of the Rosensweig instability [2], driven surface waves [3] occur. Theese surface waves cause a transport of ferrofluid, which is analysed by means of radioscopy. For supercritical magnetic field strengths, a frequency dependent pattern formation can be observed. The effect of locomotion and the structural transitions in the subcritical and the supercritical regime are studied. The results are compared to Refs.[4,5].

[1] R. Krauss, M. Liu, B. Reimann, R. Richter, I. Rehberg, Appl. Phys. Lett. 86 024102-1 (2005)

[2] M. D. Cowley and R. E. Rosensweig, J. Fluid Mech. 30 671 (1967)

[3] A. Beetz, C. Gollwitzer, R. Richter, I. Rehberg, J. Phys.: Condens. Matter 20 204109 (2008)

[4] S. Rüdiger, E. M. Nicola, J. Casademunt, L. Kramer, Physics Reports 447 73-111 (2007)

[5] K. Zimmermann, I. Zeidis, V.A. Naletova, V.A. Turkov, J. Magn. Magn. Mater. 268 227 (2004)