https://doi.org/10.1140/epje/i2016-16069-6
Regular Article
Non-equilibrium dynamics of magnetically anisotropic particles under oscillating fields
1
Institute of Physics, Technische Universität Chemnitz, 09107, Chemnitz, Germany
2
Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
* e-mail: gabi.steinbach.de@gmail.com
Received:
23
March
2016
Revised:
31
May
2016
Accepted:
2
June
2016
Published online:
14
July
2016
In this article, we demonstrate how magnetic anisotropy of colloidal particles can give rise to unusual dynamics and controllable rearrangements under time-dependent fields. As an example, we study spherical particles with a radially off-centered net magnetic moment in an oscillating field. Based on complementary data from a numerical simulation of spheres with shifted dipole and experimental observations from particles with hemispherical ferromagnetic coating, it is explained on a two particle basis how this magnetic anisotropy causes nontrivial rotational motion and magnetic reorientation. We further present the behavior of larger ensembles of coated particles. It illustrates the potential for controlled reconfiguration based on the presented two-particle dynamics.
Key words: Topical Issue: Nonequilibrium Collective Dynamics in Condensed and Biological Matter
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2016
