旋转场驱动下非轴向偶极棒的稳态
Steady states of non-axial dipolar rods driven by rotating fields
摘要：
我们研究了一个二维的具有各向异性几何形状的磁性胶体（棒）系统受到振荡的外部磁场。的稳定状态的结构和动力学特性进行了分析，通过Langevin动力学模拟，作为一个功能的不对准的固有磁偶极子的杆相对于其轴向方向，也在外部磁场的强度和旋转频率。偶极相对于其轴向方向的未对准受到最近研究的启发，这在系统的微观聚集态中是极其相关的。磁棒对外部磁场的动态响应强烈地受到这种未对准的影响。关于磁棒和外部磁场方向之间的同步，我们定义了三种不同的同步机制。一组稳态图，显示的幅度和旋转频率的间隔，观察到不同的自组织结构。
英文摘要：
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.
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