Energy competition and the contribution of Cu layer to the anisotropy field in Ni nanowires

• Published in: Applied nanoscience Vol. 13; no. 8; pp. 5795 - 5806
• Main Authors: Castro-Lopes, S., Oliveira, D. M., Abrão, J. E., Galembeck, A., Padrón-Hernández, E.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.08.2023; Springer Nature B.V
• Subjects: Anisotropy; Chemistry and Materials Science; Composition; Copper; Diameters; Ferromagnetic resonance; Ferromagnetism; Magnetic anisotropy; Magnetic properties; Materials Science; Membrane Biology; Nanochemistry; Nanotechnology; Nanotechnology and Microengineering; Nanowires; Nickel; Original Article; Segments; Thickness; Electrodeposition; FMR; Nanowires; EDS line-scan
• ISSN: 2190-5509; 2190-5517
• DOI: 10.1007/s13204-023-02829-y

Nickel and composition-modulated nanowires (Ni/Cu) were obtained by electrodeposition inside membranes with a pore diameter of about 250 nm. Microscopy measurements show good-quality wires and XRD results show preferential direction of growth at [111] along the wires. EDS mapping confirmed the modulation by composition (Ni/Cu) and allowed investigating the presence of copper in the nickel segments. The ferromagnetic resonance measurements show that the magnetization easy axis is perpendicular to the wires with an anisotropy field of 3.48 kOe. The composition-modulated wires present an anisotropy field close to zero and with an orientation that changes with the thickness of the Cu layer. In this way, the Cu layer and the synthesis conditions are decisive for the properties of the nanowires, being reflected in the magnetic properties resulting from these systems. For different Cu thicknesses, the distances between the Ni segments are modified, and therefore, the magnetic anisotropy field is affected as shown in the measurements by ferromagnetic resonance.