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Steady states of non-axial dipolar rods driven by rotating fields

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Abstract

We investigate a two-dimensional system of magnetic colloids with anisotropic geometry (rods) subjected to an oscillating external magnetic field. The structural and dynamical properties of the steady states are analyzed, by means of Langevin dynamics simulations, as a function of the misalignment of the intrinsic magnetic dipole moment of the rods with respect to their axial direction, and also in terms of the strength and rotation frequency of an external magnetic field. The misalignment of the dipole relative to their axial direction is inspired by recent studies, and this is extremely relevant in the microscopic aggregation states of the system. The dynamical response of the magnetic rods to the external magnetic field is strongly affected by such a misalignment. Concerning the synchronization between the magnetic rods and the direction of the external magnetic field, we define three distinct regimes of synchronization. A set of steady states diagrams are presented, showing the magnitude and rotation frequency intervals in which the distinct self-organized structures are observed.

Graphical abstract: Steady states of non-axial dipolar rods driven by rotating fields

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Article information


Submitted
19 Aug 2019
Accepted
16 Dec 2019
First published
17 Dec 2019

Soft Matter, 2020, Advance Article
Article type
Paper

Steady states of non-axial dipolar rods driven by rotating fields

J. L. C. Domingos, E. A. de Freitas and W. P. Ferreira, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM01671F

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