Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 21: Complex Fluids and Colloids II (joint session CPP/DY)
DY 21.2: Talk
Tuesday, March 13, 2018, 09:45–10:00, C 264
Self-assembly of colloidal particles with a magnetic coating under external magnetic fields — Gabi Steinbach1,2, Michael Schreiber1, Dennis Nissen3, Manfred Albrecht3, •Ekaterina Novak4, Pedro A. Sanchez5, Sofia Kantorovich4,5, Sibylle Gemming1,2, and Artur Erbe2 — 1Institute of Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany — 2Lenin Av.51 — 3Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — 4Ural Federal University, Lenin av. 51, Ekaterinburg, 620000, Russia — 5Computational Physics, Universität Wien, Sensengasse 8, Vienna, 1090, Austria
In recent years, in order to build tailored structures, magnetic nanoparticles and colloids that deviate from the model of a spherical particle with a dipole moment at its center were studied. Among them are dumbbells, magnetic core-shell particles, elongated ferroparticles, and colloidal particles with a magnetic cap. In this contribution, we both experimentally and numerically shows how an equilibrium state with non-collinear arrangement of the magnetic moments of colloidal particles with a magnetic cap enables the controlled self-assembly of diverse structures in two dimensions via constant and low-frequency external magnetic fields. Branched clusters of staggered chains, compact clusters, linear chains, and dispersed single particles can be formed and interconverted. The presented precise control of structure formation and reconfiguration under external fields of only a few mT open new potential for using in responsive materials for highly sensitive magnetic and optical applications.