Synthesis and characterization of cobalt–nickel alloy nanowires
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We report on the synthesis and magnetic characterization of ordered arrays of cobalt–nickel alloy nanowires. These alloy nanowires were electrodeposited into the pores of anodic alumina templates. The physical properties of the samples were investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and vibrating sample magnetometer. We found that for the alloy nanowires the field at which the magnetization saturates increases with increasing Co fraction and the saturation field in the normal direction is smaller than the parallel direction, indicating easy magnetization direction normal to wire axis. Nanowires with different compositional ratio of cobalt and nickel showed a nonlinear dependence of coercivity as a function of cobalt concentration. These findings will help tailor magnetic nanoalloys with controlled properties for various applications, such as high density magnetic storage or nanoelectrode arrays.
KeywordsNanowire Array Cobalt Concentration Wire Axis Alumina Template Easy Magnetization Direction
PMA and RV acknowledge funding support from the RPI Nanoscale Science and Engineering Initiative of the National Science Foundation under NSF award numbers DMR-0117792 and DMR-0642573 on directed assembly of nanostructures and Philip Morris USA. The authors acknowledge Prof. G.W. Meng and Dr. Y.Y. Jung for helpful discussion. ST acknowledge financial support provided by SIUC ORDA through start-up funds.
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