Effect of Ni precursor solution concentration on the magnetic properties and exchange bias of Ni-NiO nanoparticulate systems
authors Roy, A; De Toro, JA; Amaral, VS; Marques, DP; Ferreira, JMF
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords NUCLEATION; KINETICS; GROWTH; FILMS
abstract We report on a comparative study of the exchange bias effect and magnetic properties of Ni-NiO nanoparticulate systems synthesized by the chemical reduction of NiCl2 solution of two different molar concentrations-1 M (high) and 0.05 M (low)-followed by annealing of the dried precipitate in the temperature range 400-600 degrees C in air. Interestingly, the samples derived from the low molarity solution have higher Ni content and larger crystallite size than those prepared from their high molarity counterparts. These molarity dependent features subsequently modulate the magnitude of the exchange bias field in the samples, which is found to be absent or small in the 0.05 M series, but of moderate value in the 1 M samples. The different physical attributes of the particles derived from different concentrations of Ni-precursor solution are explained by invoking different nucleation kinetics and supersaturation degrees surrounding the viable growing nucleus. Furthermore, an observed increase of exchange bias with increasing annealing temperature, in contrast to the reported agglomeration of particles on annealing and subsequent reduction in bias magnitude, has been explained in correlation to the Ni-NiO interface density. (C) 2014 AIP Publishing LLC.
publisher AMER INST PHYSICS
issn 0021-8979
year published 2014
volume 116
issue 9
digital object identifier (doi) 10.1063/1.4894629
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000342827800039
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