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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Poster Session III-2
CPP 51.1: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
Modeling the interaction of magnetically capped colloidal particles — •Maximilian Neumann1, Artur Erbe2, Sofia S. Kantorovich3, Pedro A. Sánchez3, Sibylle Gemming1,2, and Gabi Steinbach1,2 — 1Institute of Physics, TU Chemnitz, D-09107 Chemnitz — 2Helmholtz-Zentrum Dresden - Rossendorf, D-01328 Dresden — 3Faculty of Physics, University of Vienna, A-1090 Vienna
Colloidal particles exhibiting spontaneous self-assembly are the precursors to bottom-up fabrication of advanced materials and micromechanical structures. There exists a comprehensive number of different particles with varying types of anisotropy with potential applications for controlled structure engineering. Here, we concentrate on particles that interact via polar fields, which are intrinsically anisotropic. More specifically, we focus on micron-sized silica spheres which are partly covered by a thin ferromagnetic layer with an out-of-plane magnetic anisotropy. With the goal of studying the assembly of such magnetic particles, we introduce a simple two-parameter model: A current-carrying coil enclosed inside a hard sphere is used to approximate an extended magnetization distribution. While the near field induced by the current reflects the extended magnetization, the far field mirrors the stray field of a point dipole. In this model the magnetization distribution is specified by the two coil parameters: The radius and the shift relative to the sphere's center. We present stable assemblies as a function of both parameters.