On the magnetostatic interactions between nanoparticles of arbitrary shape
On the magnetostatic interactions between nanoparticles of arbitrary shape
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DOI：
10.1016/j.jmmm.2003.12.1314
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发表时间：
2004-07-01
影响因子：
2.7
通讯作者：
De Graef, M
中科院分区：
文献类型：
--
作者：
Beleggia, M;Tandon, S;De Graef, M
在傅立叶空间方法的框架内，推导出两个任意形状和磁化状态的磁化纳米颗粒的静磁能的一般表达式。它示出了如何标准的偶极-偶极相互作用，有效的大粒子间的距离，应修改，以考虑到每个粒子的形状各向异性。给出了两个相互作用圆柱体的简单系统的显式计算。对于磁性纳米线，即，对于具有非常大的纵横比的圆柱体，简单的推导表明相互作用是单极的，而不是偶极的。(C)2003 Elsevier B. V.保留所有权利。
The general expression for the magnetostatic energy of two magnetized nanoparticles with arbitrary shape and magnetization state is derived within the framework of a Fourier space approach. It is shown how the standard dipole-dipole interaction, valid for large interparticle distances, should be modified in order to take into account the shape anisotropy of each particle. Explicit computations are given for a simple system of two interacting cylinders. For magnetic nanowires, i.e., cylinders with a very large aspect ratio, a simple derivation shows that the interaction is of monopolar, rather than dipolar, nature. (C) 2003 Elsevier B.V. All rights reserved.