Preparation and nanoscale characterization of electrodeposited CoFe-Cu multilayer nanowires
Autor: | Ajit K. Patra, Diana Pohl, Shivani Agarwal, Kornelius Nielsch, Manvendra Singh Khatri |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Anodizing Scanning electron microscope Nanowire Oxide 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetocrystalline anisotropy 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Transmission electron microscopy General Materials Science Composite material 0210 nano-technology Layer (electronics) |
Zdroj: | Materials Chemistry and Physics. 230:231-238 |
ISSN: | 0254-0584 |
Popis: | CoFe-Cu multilayered nanowires have been fabricated by pulse electrodeposition into the pores of ∼100 nm diameter anodized aluminum oxide (AAO) templates. Here, we investigate three samples, where the magnetic layer thickness is increased by extending the pulse time tCoFe 10 s, 13 s and 16 s while keeping the non-magnetic layer thickness constant (tCu = 30 s). Scanning electron microscopy and transmission electron microscopy confirm uniform, continuous and densely packed wires. By increasing the CoFe deposition time the aspect ratio enhanced and a layer stacking is demonstrated. The EDX line scan along the single nanowire indicates that they are Cu-rich with the composition of 10–15% Co, 0–5% Fe and 75–80% Cu. Magnetic measurements reveal a temperature dependency of the coercivity. The increase in coercivity is associated with the inherent shape and magnetocrystalline anisotropy of the nanowires. Magnetic measurements at low temperature exhibited the increase in coercivity of CoFe-Cu nanowires as a result of the freezing of thermal fluctuations. |
Databáze: | OpenAIRE |
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