Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101724
Title: Field-responsive colloidal assemblies defined by magnetic anisotropy
Authors: Steinbach, G.
Schreiber, M.
Nissen, D.
Albrecht, M.
Novak, E.
Sánchez, P. A.
Kantorovich, S. S.
Gemming, S.
Erbe, A.
Issue Date: 2019
Publisher: American Physical Society
Citation: Field-responsive colloidal assemblies defined by magnetic anisotropy / G. Steinbach, M. Schreiber, D. Nissen, et al. — DOI 10.1103/PhysRevE.100.012608 // Physical Review E. — 2019. — Vol. 100. — Iss. 1. — 012608.
Abstract: 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. © 2019 American Physical Society.
Keywords: BIOCOMPATIBILITY
COLLOIDS
FUNCTIONAL MATERIALS
MAGNETIC ANISOTROPY
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIZATION
ANISOTROPIC MAGNETIZATION
DIPOLAR INTERACTION
EXTERNAL MAGNETIC FIELD
LINEAR ARRANGEMENTS
MAGNETIZATION DISTRIBUTION
PARTICLE DISPERSION
STRUCTURAL COMPLEXITY
STRUCTURAL DIVERSITY
MAGNETIC BUBBLES
ANISOTROPY
ARTICLE
CALCULATION
DIPOLE
MAGNETIC FIELD
URI: http://hdl.handle.net/10995/101724
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85070057050
PURE ID: 10290499
e8735f56-eef5-4063-94da-ad94b7979c2e
ISSN: 24700045
DOI: 10.1103/PhysRevE.100.012608
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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