Monte Carlo calculations of the microstructure of barium ferrite dispersions
Monte Carlo calculations of the microstructure of barium ferrite dispersions
复制标题
钡铁氧体分散体微观结构的蒙特卡罗计算
DOI：
10.1088/0022-3727/31/14/007
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
P. Bissell
中科院分区：
文献类型：
--
作者：
N. S. Walmsley;G. N. Coverdale;R. Chantrell;D. Parker;P. Bissell
A Monte Carlo (MC) model has been developed to investigate the influences of the volume packing fraction and applied field on the equilibrium microstructure of a dispersion of barium ferrite particles. We accounted for magnetostatic interaction effects by using a surface charge model which allows the calculation of the energy term required for the Metropolis-type MC algorithm. In addition to single particle moves, the model employs a clustering algorithm, based on particle proximity, in order to take into account the cooperative behaviour of the particles bound by magnetostatic energy. The stacks which are thought to be characteristic of barium ferrite systems are an example of this type of binding. Our study provides strong evidence, in agreement with experiment, for the formation of stacks both in the zero field and in the applied field equilibrium configurations. The simulation also predicts, by considering the effects of the packing density, that the dispersion properties are strongly affected by the mobility of these stacks. The equilibrium particle configurations have been investigated using a correlation function and visualized by computer graphics. The magnetic behaviour has been investigated by calculation of the magnetization curve.
