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Electrochemical synthesis and magnetic characterization of periodically modulated Co nanowires

机译：周期调制钴纳米线的电化学合成和磁性表征

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摘要

The synthesis of templates with modulated pore channels by combined mild and hard anodization processes is described. The hard anodization pulses, implemented during anodization, are controlled not only in time length and amplitude, but also in shape: square and exponential signals have been applied. Electrodeposition of Co is subsequently performed to obtain uniform and modulated diameter nanowire arrays. Square and exponential modulated diameter nanowires are imaged by scanning electron microscopy and hcp hexagonal polycrystalline structure is confirmed in all Co nanowires. Magnetic behavior strongly depends on nanowire shape and is interpreted considering the modification of magnetostatic interactions between wires induced by local stray fields from magnetic charges at the ends of the wider segments in modulated wires. As a consequence, magnetization processes under parallel and perpendicular field configurations denote the contribution of both thin and wide segments.
机译：描述了通过组合的轻度和硬质阳极氧化工艺合成具有可调节孔道的模板。在阳极氧化过程中实施的硬质阳极氧化脉冲不仅在时间长度和幅度上受到控制，而且在形状上也受到控制：已经施加了方形和指数信号。随后进行Co的电沉积以获得均匀且调制直径的纳米线阵列。通过扫描电子显微镜对方形和指数调制直径纳米线成像，并在所有Co纳米线中确认了hcp六角形多晶结构。磁性行为在很大程度上取决于纳米线的形状，并考虑到调制后的导线中较宽段的末端的磁电荷引起的局部杂散场引起的导线之间的静磁相互作用的改变，从而解释了磁性行为。结果，在平行和垂直磁场配置下的磁化过程表示薄段和宽段的贡献。

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