镍纳米线阵列的剩磁：尺寸和迷宫磁结构的影响
Remanence of Ni nanowire arrays: Influence of size and labyrinth magnetic structure
摘要：
研究了镍纳米线阵列体系的宏观尺寸对其剩磁态的影响。一个简单的磁唯象模型已被开发，以获得作为在阵列中的静磁相互作用的函数的剩磁。我们观察到，由于线之间的偶极相互作用的长范围，样品的大小强烈影响的阵列的剩磁。另一方面，利用变场磁力显微镜研究了纳米线的磁性状态。从磁图像中推断出了纳米线在上下方向上磁化以及随后的反向磁化的分布。两个具有相似能量的短程磁有序的存在可以解释在纳米线阵列的磁力显微镜图像中观察到的典型迷宫图案。
英文摘要：
The influence of the macroscopic size of the Ni nanowire array system on their remanence state has been investigated. A simple magnetic phenomenological model has been developed to obtain the remanence as a function of the magnetostatic interactions in the array. We observe that, due to the long range of the dipolar interactions between the wires, the size of the sample strongly influence the remanence of the array. On the other hand, the magnetic state of nanowires has been studied by variable field magnetic force microscopy for different remanent states. The distribution of nanowires with the magnetization in up or down directions and the subsequent remanent magnetization has been deduced from the magnetic images. The existence of two short-range magnetic orderings with similar energies can explain the typical labyrinth pattern observed in magnetic force microscopy images of the nanowire arrays.
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