Nickel zinc ferrite nanoparticles in the size range of 30–40 nm have been prepared. Coated with polyelectrolyte, the particles were induced to assemble on glass substrates under strong magnetic fields from 0.25 to 0.5 T. The predominant orientation of the assembled chains was observed to be along the direction of the magnetic line of force. As the coating layers increased, ring morphology could be observed. The magnetic properties of the assembled structures were measured and compared to those of ferrite particles prepared without a magnetic field applied.
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Zhang et al. (2005) studied this question.
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