Abstract—

Co/Cu and Ni/Cu nanowires with metal layers of different thicknesses are obtained by matrix synthesis (the galvanic filling of pores in an ion-track membrane). The electrolytes are selected and the modes of electrodeposition are determined. For cobalt nanowires, the layer thicknesses vary in the range from 25 to 400 nm; for nickel nanowires, samples with thin layers from 7 to 15 nm are obtained. Electron-microscopy studies are carried out, which reveal the strict periodicity of the layers. Magnetic-force microscopy performed on a cleaved membrane with nanowires shows their division into domains and the weak interaction of neighboring nanowires. According to the results of magnetometry, the direction of the easy magnetization axis in Co/Cu nanowires depends on the geometry of the magnetic layer. At layer thicknesses greater than the nanowire diameter, the easy magnetization axis is directed along the nanowire axis; as the layer thickness decreases, it becomes perpendicular to the axis. In Ni/Cu samples (7-nm layers), the easy magnetization axis is also located perpendicular to the nanowire axis. An increase in the copper impurity content in these samples leads to a noticeable increase in the coercive force. The giant magnetoresistance effect is found in these samples with a value of about 1%; it is shown to weakly depend on the number of layers and on the copper impurity in the magnetic layer (within the studied limits).

中文翻译：

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层状 Co/Cu 和 Ni/Cu 纳米线：结构与磁性之间的关系

摘要——

具有不同厚度金属层的 Co/Cu 和 Ni/Cu 纳米线是通过基质合成（离子轨道膜中的孔的电流填充）获得的。选择电解质并确定电沉积模式。对于钴纳米线，层厚在 25 到 400 nm 范围内变化；对于镍纳米线，可以获得具有 7 至 15 nm 薄层的样品。进行了电子显微镜研究，揭示了层的严格周期性。在具有纳米线的切割膜上进行的磁力显微镜显示它们划分为域以及相邻纳米线的弱相互作用。根据磁力测量的结果，Co/Cu纳米线中易磁化轴的方向取决于磁性层的几何形状。在大于纳米线直径的层厚处，易磁化轴沿纳米线轴定向；随着层厚度减小，它变得垂直于轴。在 Ni/Cu 样品（7 nm 层）中，易磁化轴也垂直于纳米线轴。这些样品中铜杂质含量的增加导致矫顽力显着增加。在这些样品中发现了巨磁阻效应，其值约为 1%；它显示出微弱地依赖于层数和磁性层中的铜杂质（在研究的范围内）。易磁化轴也垂直于纳米线轴。这些样品中铜杂质含量的增加导致矫顽力显着增加。在这些样品中发现了巨磁阻效应，其值约为 1%；它显示出微弱地依赖于层数和磁性层中的铜杂质（在研究的范围内）。易磁化轴也垂直于纳米线轴。这些样品中铜杂质含量的增加导致矫顽力显着增加。在这些样品中发现了巨磁阻效应，其值约为 1%；它显示出微弱地依赖于层数和磁性层中的铜杂质（在研究的范围内）。