Tailoring structural and magnetic properties of NiCu nanowires by electrodeposition

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects Pub Date : 2024-09-01 DOI:10.1016/j.nanoso.2024.101309

S. Castro-Lopes , D.M. Oliveira , J.E. Abrão , L.K.C.S. Assis , J.F.O. Silva , J. Neves-Araújo , J.M. Soares , A.R. Rodrigues , E. Padrón-Hernández

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引用次数: 0

Abstract

In this work, we investigated the tailoring of structural and magnetic properties of NiCu nanowires through electrodeposition. Continuous (S1) and composition-modulated (S2) wires were fabricated by electrodeposition using porous alumina membranes as a template. Morphological characterization revealed that the total length of the wires was 8 ± 3 µm in both S1 and S2. For the composition-modulated wires, the length of the segments with the lowest and highest Cu concentrations was 1.2 ± 0.4 µm and 226 ± 65 nm, respectively. Mapping by energy dispersive spectroscopy (EDS) revealed that the concentration of copper and nickel varied along the length of the composition-modulated nanowires, while the continuous nanowires contained a relatively constant concentration of both metals. It is demonstrated that the change in Cu concentration along the wire modifies the lattice parameter, average crystallite size (D) and lattice strain (ε) of Ni. This result is pivotal for understanding the magnetic properties of the wires, as nickel is primarily responsible for the magnetic behavior of the wires. From the ferromagnetic resonance (FMR) results, the linewidth and resonance field values for samples S1 and S2 were determined. It was demonstrated that the greater deformation in the nickel lattice in NiCu nanowires increases the angular dependence of the resonance field. Furthermore, the smaller nickel crystallite size was shown to increase spin dispersion and magnetic damping, leading to complex behavior in FMR responses. Finally, it was demonstrated how Cu can influence the magnetic properties such as coercivity (H_C) and squareness (M_R/M_S) of the wires. Overall, this work contributes to understanding the tailoring of structural and magnetic properties of NiCu nanowires through electrodeposition.

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利用电沉积技术定制镍铜纳米线的结构和磁性能

在这项工作中，我们研究了通过电沉积来定制镍铜纳米线的结构和磁性能。我们以多孔氧化铝膜为模板，通过电沉积制造了连续（S1）和成分调制（S2）纳米线。形态特征显示，S1 和 S2 晶丝的总长度均为 8 ± 3 µm。对于成分调节型金属丝，铜浓度最低和最高的段长度分别为 1.2 ± 0.4 µm 和 226 ± 65 nm。能量色散光谱（EDS）绘图显示，铜和镍的浓度沿成分调制纳米线的长度变化，而连续纳米线中这两种金属的浓度相对恒定。研究表明，铜浓度沿纳米线的变化会改变镍的晶格参数、平均晶粒尺寸 (D) 和晶格应变 (ε)。这一结果对于理解金属丝的磁性能至关重要，因为镍是金属丝磁性能的主要成分。根据铁磁共振（FMR）结果，确定了样品 S1 和 S2 的线宽和共振场值。结果表明，镍铜纳米线中镍晶格的变形越大，共振场的角度依赖性就越大。此外，较小的镍晶粒尺寸也会增加自旋弥散和磁阻尼，从而导致调频响应的复杂行为。最后，研究还证明了铜如何影响导线的磁性能，如矫顽力（HC）和方正度（MR/MS）。总之，这项研究有助于理解通过电沉积定制镍铜纳米线的结构和磁性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .