Directed magnetic field induced assembly of high magnetic moment cobalt nanowires |
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| Authors: | A K Srivastava S Madhavi R V Ramanujan |
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| Institution: | (1) School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore;(2) Center for Nanoscale Science & Engineering, Department of Electrical and Computer Engineering, University of Kentucky, Lexington, KY 40506-0046, USA; |
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| Abstract: | A directed magnetic field induced assembly technique was employed to align two phase (h.c.p. + f.c.c.) cobalt nanoparticles
in a mechanically robust long wire morphology. Co nanoparticles with an average size of 4.3 nm and saturation magnetization
comparable to bulk cobalt were synthesized by borohydride reduction followed by size selection and magnetic field induced
assembly. The coercivity of these nanowires was higher than their nanoparticle counterpart due to shape anisotropy. The experimental
coercivity values of the nanowires were lower than the predictions of the coherent rotation, fanning and curling models of
coercivity due to the preponderance of superparamagnetic particles with zero coercivity. |
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