Magnetization Reversal and Surface Spins in Electrodeposited Co₉₀Mn₁₀ Alloy Nanowires

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• 作者：Naeem Ahmad ; Sajid Tanweer ; Suleman Khan…
• 关键词：CoMn nanowire arrays ; Magnetization reversal ; Curling and nucleation mode ; Freezing temperature
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：2
• 页码：505-509
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

文摘

In this work, Co_1−XMn_X(X= 10) nanowires have been prepared by DC electrodeposition into anodized aluminum oxide (AAO) templates. A systematic study has been done about the effects of nanowires composition on the shapes of MH curves and magnetic properties. It is observed from XRD pattern that Co₉₀Mn₁₀ nanowires have polycrystalline structure with dominant FCC Cobalt phase. The M-H curves at two angles between magnetic field and nanowires axis define a clear and sharp anisotropic behavior. The magnetization reversal mechanism is found to be curling mode for certain angle between applied magnetic field and nanowires axis and then by nucleation mode. In order to elucidate the transition temperature, temperature dependent magnetization properties for Co₉₀Mn₁₀ nanowires at different applied fields have also been measured. The transition temperature or freezing temperature is found to be 350 K. The bifurcation of FC and ZFC curves is explained by the freezing of the surface spins, depinning of the domain walls and superparamagnetic nanoparticles on the surface of the nanowires.