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Magnetic Properties of Ni-NiO (Ferromagnetic–Antiferromagnetic) Nanocomposites Obtained from a Partial Mechanochemical Reduction of NiO

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Abstract:

The magnetic properties of ferromagnetic (FM)–antiferromagnetic (AFM), Ni-NiO, nanocomposites obtained from a reactive ball milling reduction of NiO in H2 atmosphere have been studied. The formation of ferromagnetic Ni from antiferromagnetic NiO can be accurately followed by the increase of the saturation magnetization. The microstructure of the nanocomposite, consisting of FM Ni nanoparticles embedded in an AFM NiO matrix leads to exchange bias effects, i.e., loop shifts and coercivity enhancement, after field cooling from above the Néel temperature of NiO.

Keywords: COERCIVITY; EXCHANGE BIAS; NANOCOMPOSITES; NICKEL; NICKEL OXIDE; REACTIVE BALL MILLING

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.010

Publication date: June 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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