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Tuning the magnetic properties of multisegmented Ni/Cu electrodeposited nanowires with controllable Ni lengths

机译：调整Ni长度可控的多段Ni / Cu电沉积纳米线的磁性

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The fabrication of segmented Ni/Cu nanowires (NWs), with tunable structural and magnetic properties, is reported. A potentiostatic electrodeposition method with a single electrolytic bath has been used to fabricate multisegmented Ni/Cu NWs inside a highly hexagonally ordered anodic nanoporous alumina membrane, with diameters of 50 nm and Ni segment lengths (L-Ni) tuned from 10 nm up to 140 nm. The x-ray diffraction results evidenced a strong dependence of the Ni NWs crystallographic face-centered-cubic (fcc) texture along the [220] direction on the aspect ratio of the NWs. The magnetic behavior of the multisegmented Ni/Cu NW arrays, as a function of the magnetic field and temperature, is also studied and correlated with their structural and morphological properties. Micromagnetic simulations, together with the experimental results, showed a dominant antiferromagnetic coupling between Ni segments along the wire length for small low aspect-ratio magnetic segments. When increasing the Ni segments' length, the magnetic interactions between these along the wire became stronger, favouring a ferromagnetic coupling. The Curie temperature of the NWs was also found to strongly depend on the Ni magnetic segment length. Particularly the Curie temperature was found to be reduced 75 K for the 20 nm Ni segments, following the finite-size scaling relation with xi(0) = 8.1 angstrom and gamma = 0.48. These results emphasize the advantages of using a template assisted method to electrodeposit multilayer NWs, as it allows an easy tailor of the respective morphological, chemical, structural and magnetic properties.
机译：报告了分段Ni / Cu纳米线（NWs）的制造，具有可调的结构和磁性。已采用具有单个电解槽的恒电位电沉积方法在高度六角有序的阳极纳米多孔氧化铝膜内制造多段Ni / Cu NW，其直径为50 nm，Ni片段长度（L-Ni）从10 nm调整到140 nm纳米X射线衍射结果表明，沿[220]方向的Ni NWs晶体面心立方（fcc）织构强烈依赖于NWs的长宽比。还研究了多段Ni / Cu NW阵列的磁行为，作为磁场和温度的函数，并将其与结构和形态特性相关联。微磁模拟和实验结果表明，对于较小的低长宽比磁片段，Ni片段之间沿线长度具有主要的反铁磁耦合。当增加镍链段的长度时，它们之间沿着导线的磁性相互作用会增强，有利于铁磁耦合。还发现NW的居里温度强烈依赖于Ni磁链段的长度。尤其是对于20 nm的Ni段，发现居里温度降低了75 K，这与xi（0）= 8.1埃和gamma = 0.48的有限尺寸比例关系有关。这些结果强调了使用模板辅助方法对多层NW进行电沉积的优势，因为它可以轻松定制相应的形态，化学，结构和磁性。

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