| Abstrakt: |
Continuous (NC-1) and composition-modulated (NC-2 and NC-3) nanowires were successfully synthesized through electrodeposition using porous alumina membranes as templates. Scanning electron microscopy was employed to estimate the total length of the nanowires, revealing lengths of 7.48 ± 1.03 μm, 5.56 ± 0.77 μm, and 8.23 ± 0.82 μm for NC-1, NC-2, and NC-3, respectively. The composition-modulated samples exhibited distinct light and dark regions along the wires, as revealed by EDS mapping. The light regions (LNi) demonstrated an increased signal for nickel and a reduced signal for copper, while the dark regions (LCu) exhibited the reverse behavior. For NC-2, LNi = 309.94 ± 65 nm and LCu = 64.45 ± 18 nm, whereas for NC-3, it was LNi = 382.25 ± 71 nm and LCu = 139.71 ± 28 nm. X-ray diffraction patterns confirmed the presence of nickel with a face-centered cubic structure in NC-1, while both NC-2 and NC-3 exhibited diffraction peaks corresponding to nickel and metallic copper, both with fcc structures. Utilizing XRD standards and the Williamson-Hall method, the crystallite size and lattice deformation of nickel were estimated, resulting in values of D = 69 nm and ε = 0.0051% for NC-1, D = 18 nm and ε = 0.0007% for NC-2, and D = 53 nm and ε = 0.0041% for NC-3. These structural parameters were observed to vary with the deposition current. Magnetization versus field measurements and ferromagnetic resonance analysis provided insights into how the modulation process influenced the magnetic anisotropy, coercivity, remanence, and resonance field of the nanowires. The findings highlight the capability of the composition modulation process to tune the structural and magnetic properties of nanowires, thereby offering potential for the development of advanced electronic devices. [ABSTRACT FROM AUTHOR] |
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