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Effect of Cu-Cr co-substitution on magnetic properties of nanocrystalline magnesium ferrite

TitleEffect of Cu-Cr co-substitution on magnetic properties of nanocrystalline magnesium ferrite
Publication TypeJournal Article
Year of Publication2012
AuthorsIqbal MJ, Ahmad Z, Melikhov Y, Nlebedim IC
Journal TitleJournal of Magnetism and Magnetic Materials
Volume324
Pages1088-1094
Date Published03
Type of ArticleArticle
ISBN Number0304-8853
Accession NumberWOS:000298864100032
KeywordsAC SUSCEPTIBILITY, cation distribution, Chemical synthesis, cobalt ferrite, coprecipitation method, DIELECTRIC-PROPERTIES, hexaferrite, magnetic anisotropy, Magnetically ordered material, mechanochemical route, mgfe2o4, MOSSBAUER, Mossbauer analysis, nanoparticles
Abstract

This study deals with the temperature and composition dependence of magnetization and magnetic anisotropy of Cu(2+)-Cr(3+) co-substituted magnesium ferrite, Mg(1-x)Cu(x)Cr(x)Fe(2-x)O(4) (x=0.0-0.5). The synthesized materials are characterized using thermo gravimetric analysis, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray fluorescence, Mossbauer spectrometer, superconducting quantum interference device magnetometer and vibrating sample magnetometer. The M-H loops measured up to 50 kOe at 300, 200 and 100 K, revealed narrow hysteresis curves with a coercive field and saturation magnetization varying for different compositions. The high field regimes of these loops are modeled using the Law of Approach to saturation to extract anisotropy information and saturation magnetization. Both the saturation magnetization and the anisotropy constant are observed to increase with the decrease in temperature while decrease with the Cu-Cr co-substituents for all the samples. Explanation of the observed behavior is proposed in terms of the preference of the co-substituent ions of Cu(2+) and Cr(3+) and their predominant choice to substitute into the octahedral sites of the cubic spinel lattice. (C) 2011 Elsevier B.V. All rights reserved.
URL<Go to ISI>://WOS:000298864100032
DOI10.1016/j.jmmm.2011.10.030
Alternate JournalJ. Magn. Magn. Mater.