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BP: Fachverband Biologische Physik

BP 28: Active Matter V (joint session DY/BP)

BP 28.11: Vortrag

Donnerstag, 12. März 2026, 12:30–12:45, ZEU/0160

Active Magnetic Particles in Magnetic Gradient Fields — •Laris Berekovic, Margaret Rosenberg, and Hartmut Löwen — Heinrich-Heine University Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf

Active particles are common in nature, underlying many complex phenomena. Since the motion of active particles has no intrinsic directionality, steering the particles' motion requires an additional control parameter, such as a magnetic interaction. In this contribution, we present an analysis of the effect of magnetic vortex fields created by a current carrying wire on the ground states and motion of active Brownian particles (ABP) carrying a fixed magnetic dipole moment. We present an analytical solution for the single-particle case, compute the ground state for multiple particles via simulated annealing in the passive case and explore the activity-induced phase transition created by increasing the self-propulsion. We find new forms in the ground state, as well as a rich variety of activity-induced structures. These results can be applied to ferrofluid systems, biophysical systems of magnetotactic bacteria or form the basis of more complex industrial applications.

Keywords: magnetic soft matter; brownian dynamics; active brownian particle (ABP)