4.5 Article

Synthesis of nanocrystalline Co-Ni alloys by precursor approach and studies on their magnetic properties

Journal

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 323, Issue 17, Pages 2271-2280

Publisher

ELSEVIER
DOI: 10.1016/j.jmmm.2011.04.006

Keywords

Precursor method; Co-precipitation; Nanocrystalline Co-Ni alloy; Polyol reduction; Magnetic property; Superparamagnetism

Funding

  1. Council of Scientific and Industrial Research, New Delhi [01(2311)/09/EMR-II]

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Nanocrystalline Co-Ni alloys with different compositions were prepared by polyol reduction of mixed cobalt nickel hydroxides. The precursors (mixed cobalt nickel hydroxides) were prepared by co-precipitation. Powder X-ray diffraction analysis indicated the formation of fcc phase in the alloys and their crystallite size in the range 17-25 nm. Scanning electron microscopy and transmission electron microscopy studies revealed the morphology of the particles as being close to spherical, and the energy dispersive X-ray analysis showed the stoichiometry of the alloys. The magnetization as a function of field and temperature of the alloys, measured using a superconducting quantum interference device, showed superparamagnetic behavior with negligible coercivity and remanence values. (C) 2011 Elsevier B.V. All rights reserved.

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