Magnetic properties of nanocrystalline Co–Ni ferrite
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A spinel structure which is formed by a nearly close-packed fcc array of anions with holes partly filled by the cations can be represented by the formula AB2O4 , A represents metallic ions located in A interstitial (tetrahedral) sites and B metallic ions located in B (octahedral) sites. Due to the large electronegativity of oxygen, the ionic type of bonds prevails in almost all oxide spinels . Magnetic properties of nanoparticles have been of great interest in recent years partly because of the development of high-density magnetic storage media with nanosized constituent particles or crystallites [3, 4]. Much attention have been attracted by the investigation of nanophase spinel ferrite particles owing to their technological importance in the application areas, such as microwave devices, high speed digital tape and disk recording, ferrofluids, catalysis, and magnetic refrigeration systems . Magneto-optical properties of CoFe2O4 and NiFe2O4have been investigated in references...
KeywordsFerrite Fe2O4 CoFe2O4 Ferrite Nanoparticles Cobalt Concentration
This work was supported by the National Natural Science Foundation of China under Grant No. 10274027.
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