A chain of ellipsoids model based on “chain-of-spheres” is proposed to investigate the reversal mechanism of the magnetic nanowire. When the diameter of the individual nanowire is small enough we assume the nanowire to be a chain of rotational symmetric ellipsoids. We investigate the reversal mechanism by this model and derive the expression of the switching field. By the numerical method, the magnetization loops and energy morphology of an irreversible rotation process are obtained, and the relation between coercivity and shape factor of the ellipsoid is discussed. The angular dependence of the switching field of the Ni nanowire is calculated, and the results accord well with the experiment results of Wernsdorfer et al. [Phys. Rev. Lett. 77, 1873 (1996)] and J.-E. Wegrowe et al. [Phys. Rev. Lett. 82, 3681 (1999)]. Fe1−xCox alloy nanowire arrays over the whole composition range have been produced by the electrochemical method, and the composition dependence of coercivity is calculated by the chain of elli...

中文翻译：

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磁纳米线的椭球链方法

提出了一种基于“球链”的椭球链模型来研究磁性纳米线的反转机制。当单个纳米线的直径足够小时，我们假设纳米线是旋转对称椭球链。我们研究了该模型的反转机制并推导出了开关场的表达式。通过数值方法得到了不可逆旋转过程的磁化回路和能量形态，并讨论了矫顽力与椭球形状因子的关系。计算了Ni纳米线开关场的角度依赖性，结果与Wernsdorfer等人的实验结果吻合良好。[物理。牧师莱特。77, 1873 (1996)] 和 J.-E. 韦格罗等人。[物理。牧师莱特。82, 3681 (1999)]。