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Field-responsive colloidal assemblies defined by magnetic anisotropy

Autor(en)
Gabi Steinbach, Michael Schreiber, Dennis Nissen, Manfred Albrecht, Ekaterina Novak, Pedro A. Sanchez, Sofia S. Kantorovich, Sibylle Gemming, Artur Erbe
Abstrakt

Particle dispersions provide a promising tool for the engineering of functional materials that exploit self-assembly of complex structures. Dispersion made from magnetic colloidal particles is a great choice; they are biocompatible and remotely controllable among many other advantages. However, their dominating dipolar interaction typically limits structural complexity to linear arrangements. This paper shows how a magnetostatic equilibrium state with noncollinear arrangement of the magnetic moments, as reported for ferromagnetic Janus particles, enables the controlled self-organization 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 reversibly in a controlled way. The structural diversity is a consequence of both the inhomogeneity and the spatial extension of the magnetization distribution inside the particles. We draw this conclusion from calculations based on a model of spheres with multiple shifted dipoles. The results demonstrate that fundamentally new possibilities for responsive magnetic materials can arise from interactions between particles with a spatially extended, anisotropic magnetization distribution.

Organisation(en)
Computergestützte Physik und Physik der Weichen Materie
Externe Organisation(en)
Helmholtz-Zentrum Dresden-Rossendorf, Universität Augsburg, Ural Federal University, Technische Universität Chemnitz
Journal
Physical Review E
Band
100
Anzahl der Seiten
10
ISSN
2470-0045
DOI
https://doi.org/10.1103/PhysRevE.100.012608
Publikationsdatum
07-2019
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie
Schlagwörter
ASJC Scopus Sachgebiete
Condensed Matter Physics, Statistical and Nonlinear Physics, Statistics and Probability
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/0bb1e8b5-b14b-4509-9aad-69ad251bdb67