Abstract

Nanowires have been formed from FeNi and FeCo alloys by the template synthesis method based on galvanic filling of pores of track membranes. A change in the nanowire elemental composition with a change in the electrolyte composition and with a change in the deposition potential has been studied. FeNi nanowires exhibit the effect of anomalous Fe codeposition: the iron content in the nanowires is much higher than that in the electrolyte. The difference increases with an increase in the initial concentration and with a decrease in the growth potential. It has also been found that the iron concentration increases in nanowire vertices. For FeCo nanowires, their composition corresponds to the electrolyte composition and changes only slightly with a change in the potential. An analysis of the X-ray diffraction data has determined the character of change in the spectra under varying growth conditions. The X-ray spectra of FeNi are found to depend on the growth potential (the intensity of phase peaks changes). Mössbauer measurements have revealed spontaneous magnetization for all samples of arrays of nanowires along their axes. The dependence of hyperfine magnetic field strength B_hf at ⁵⁷Fe nuclei on the composition of nanowires of Fe_xCo_1 – x and Fe_xNi_1 – x solid solutions is obtained for the first time. It is found that the B_hf value decreases with an increase in the electrodeposition rate (or with an increase in deposition potential U).

中文翻译：

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由FeNi和FeCo合金制成的纳米线：合成，结构和Mössbauer测量

摘要

通过基于轨道膜孔的电流填充的模板合成方法，由FeNi和FeCo合金形成纳米线。已经研究了纳米线元素组成随电解质组成的变化以及沉积电势的变化。FeNi纳米线表现出异常的Fe共沉积作用：纳米线中的铁含量远高于电解质中的铁含量。差异随着初始浓度的增加和生长潜力的降低而增加。还已经发现，铁浓度在纳米线顶点中增加。对于FeCo纳米线，其成分与电解质成分相对应，并且随着电势​​的变化而仅略有变化。对X射线衍射数据的分析已确定了在变化的生长条件下光谱变化的特征。发现FeNi的X射线光谱取决于生长势（相峰强度改变）。莫斯鲍尔（Mössbauer）的测量揭示了沿其轴方向的所有纳米线阵列样品的自发磁化强度。超细磁场强度的依赖性乙_HF在^57级的Fe的核对Fe纳米线的组合物_X共_{1 -  X}和Fe _X的Ni _{1 -  X}首次获得的固溶体。已经发现，B _hf值随着电沉积率的增加（或者随着沉积电位U的增加）而降低。