Directed magnetic field induced assembly of high magnetic moment cobalt nanowires

Akhilesh Kumar Srivastava; S. Madhavi; R.V. Ramanujan

doi:10.1007/s00339-009-5537-z

Directed magnetic field induced assembly of high magnetic moment cobalt nanowires

Akhilesh Kumar Srivastava, S. Madhavi, R.V. Ramanujan

Nanyang Technological University

Research output: Contribution to journal › Journal article › Research › peer-review

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.

Original language	English
Journal	Applied Physics A: Materials Science & Processing
Volume	98
Issue number	4
Pages (from-to)	821-830
ISSN	0947-8396
DOIs	https://doi.org/10.1007/s00339-009-5537-z
Publication status	Published - 2010

Keywords

Solid Oxide Fuel Cells
Fuel Cells and hydrogen

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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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N2 - 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.

AB - 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.

KW - Solid Oxide Fuel Cells

KW - Fuel Cells and hydrogen

KW - Brændselsceller og brint

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JO - Applied Physics A: Materials Science & Processing

JF - Applied Physics A: Materials Science & Processing

IS - 4

ER -

Directed magnetic field induced assembly of high magnetic moment cobalt nanowires

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