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Issue 11, 2016
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Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

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Abstract

Nanocrystalline Co substituted Ni–Zn ferrites with the general formula CoxNi0.6−xZn0.4Fe2O4 (x = 0.0 to 0.6) were prepared by a precursor combustion method. Average crystallite size, as estimated by using a Scherrer method and the particle size obtained from transmission electron microscopy (TEM) techniques, was found to be in the range of 10–30 nm. EDX and XRD analysis confirms the presence of Co, Ni, Zn, Fe and oxygen and the desired phases in the prepared nanoparticles. Selective area electron diffraction (SAED) analysis confirms the crystalline nature of the prepared nanoparticles. It is observed that Co substitution has a pronounced effect on the magnetic properties such as MR, MS and HC and also on the Curie temperature (TC), which is found to decrease from 420 °C for non-substituted Ni–Zn ferrites to 325 °C for the highest substitution of x = 0.6. These effects are assigned to the higher magnetocrystalline anisotropy of Co than Ni and to the size dependent existence of single domain–superparamagnetic particles distribution. Comparatively, the dominant existence of single domain particles with Co substitution over superparamagnetic particles in non-substituted nickel zinc ferrites is extensively investigated in this article.

Graphical abstract: Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

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Publication details

The article was received on 08 Jul 2016, accepted on 20 Sep 2016 and first published on 21 Sep 2016


Article type: Paper
DOI: 10.1039/C6NJ02121B
Citation: New J. Chem., 2016,40, 9275-9284
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    Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

    S. G. Gawas, S. S. Meena, S. M. Yusuf and V. M. S. Verenkar, New J. Chem., 2016, 40, 9275
    DOI: 10.1039/C6NJ02121B

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