Steady states of non-axial dipolar rods driven by rotating fields.,Soft Matter

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Steady states of non-axial dipolar rods driven by rotating fields.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-03 , DOI: 10.1039/c9sm01671f
Jorge L C Domingos ₁ , Everton A de Freitas , W P Ferreira

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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.

中文翻译：

旋转场驱动的非轴向偶极杆的稳态。

我们研究具有各向异性几何形状（棒）的磁胶体的二维系统，该系统受到外部振荡磁场的影响。借助朗格文动力学模拟，分析了稳态的结构和动力学特性，这些特性是杆的固有磁偶极矩相对于其轴向方向的失准以及强度和旋转的函数。外部磁场的频率。偶极子相对于其轴向方向的未对准是受到最近研究的启发，这在系统的微观聚集状态中极为相关。磁棒对外部磁场的动态响应受到这种未对准的强烈影响。关于磁棒与外部磁场方向之间的同步，我们定义了三种不同的同步方式。给出了一组稳态图，显示了观察到不同的自组织结构的幅度和旋转频率间隔。

更新日期：2020-02-13

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