Fluoride ion assisted growth of hierarchical flowerlike nanostructures of Co/Ni ferrites and their magnetoresistive response

One-dimensional nanorod arrays exhibiting hierarchical flowerlike morphologies, of Co and Ni based ferrites were synthesized by hydrothermal treatment and using ammonium fluoride (NH 4 F) as a mineralizing agent. The effects of NH 4 F concentration and synthesis temperature were probed to control th...

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Published inRSC advances Vol. 9; no. 31; pp. 17581 - 1759
Main Authors Abbas, Syed Kumail, Atiq, Shahid, Saleem, Murtaza, Riaz, Saira, Naseem, Shahzad, Anwar, M. Sabieh
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 04.06.2019
The Royal Society of Chemistry
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Summary:One-dimensional nanorod arrays exhibiting hierarchical flowerlike morphologies, of Co and Ni based ferrites were synthesized by hydrothermal treatment and using ammonium fluoride (NH 4 F) as a mineralizing agent. The effects of NH 4 F concentration and synthesis temperature were probed to control the morphology of these nanorods that were formed as a result of crystal nucleation. It was observed that a higher concentration of NH 4 F leads to several other nucleation sites above these nanorods while controlled concentration of precursors and NH 4 F results in the synthesis of floral patterns. The specific geometries of these nanorods leads to a shape anisotropy effect resulting in increased magnetic coercive fields. To study the effect of magnetic field on the resistance and current density, impedance spectroscopy and I - V - R characteristics, respectively, were performed. Nanorods show enhanced values for resistance with the increase in magnetic field confirming the effect of magnetoresistive coupling while a decrease in current densities with increasing magnetic field highlights the potential of these structures for magnetoresistive applications. One-dimensional nanorod arrays of Co/Ni ferrites emerging into hierarchical flowerlike morphologies, prepared by hydrothermal treatment, using ammonium fluoride (NH 4 F) as a mineralizing agent.
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ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra03295a