A model of an isolated column of metal evaporated tape
A model of an isolated column of metal evaporated tape
复制标题
金属蒸镀带隔离柱模型
DOI：
10.1109/20.617843
复制
发表时间：
1997
影响因子：
2.1
通讯作者：
P. Bissell
中科院分区：
文献类型：
--
作者：
G. E. Kay;A. Hart;D. Parker;P. Bissell
金属蒸发（ME）磁带由一束斜柱组成，每一束斜柱由小结晶增益组成。为了模拟ME磁带的磁性行为，我们开发了一个模型，使用蒙特卡罗算法来表示球形颗粒的单列，其半径由对数正态分布产生。利用朗道-利夫希茨方程探讨了磁矩的动力学过程。我们证明了柱的微观结构和易轴的方向影响磁反转过程。通过改变交换耦合参数的强度，报告了其对协同交换量的影响。结果表明，高交换耦合可以保持力矩对齐，从而产生更高的矫顽力值。反转机制在柱的末端启动，然后通过柱传播。
Metal Evaporated (ME) tape comprises bundles of inclined columns each of which consists of small crystalline gains. To simulate the magnetic behaviour of ME tape we have developed a model, using a Monte Carlo algorithm to represent a single column of spherical grains whose radii are generated from a log-normal distribution. The dynamic process of the magnetic moments is explored by utilizing the Landau-Lifschitz equations. We demonstrate that the microstructure of the column and direction of the easy axes influence the magnetic reversal process. By varying the strength of the exchange coupling parameter its effect on the amount of co-operative switching is reported. The results suggest that high exchange coupling acts to keep moments aligned, resulting in higher values of coercivity. The reversal mechanism is initiated at the ends of the column and then propagates through the column.