Lucena D, Ferreira W P, Munarin F F, Farias G A, Peeters F M
Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jan;87(1):012307. doi: 10.1103/PhysRevE.87.012307. Epub 2013 Jan 14.
The diffusion of a system of ferromagnetic dipoles confined in a quasi-one-dimensional parabolic trap is studied using Brownian dynamics simulations. We show that the dynamics of the system is tunable by an in-plane external homogeneous magnetic field. For a strong applied magnetic field, we find that the mobility of the system, the exponent of diffusion, and the crossover time among different diffusion regimes can be tuned by the orientation of the magnetic field. For weak magnetic fields, the exponent of diffusion in the subdiffusive regime is independent of the orientation of the external field.
利用布朗动力学模拟研究了限制在准一维抛物线阱中的铁磁偶极子系统的扩散。我们表明，该系统的动力学可通过平面内外部均匀磁场进行调节。对于强外加磁场，我们发现系统的迁移率、扩散指数以及不同扩散区域之间的交叉时间可通过磁场方向进行调节。对于弱磁场，亚扩散区域的扩散指数与外部场的方向无关。
