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Magnetic Properties of Hard/Soft Nanocomposite Ferrite Synthesized by Self-Combustion Precursors
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 Title & Authors
Magnetic Properties of Hard/Soft Nanocomposite Ferrite Synthesized by Self-Combustion Precursors
Oh, Young Woo; Ahn, Jong Gyeon;
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The goal of this research is the create novel magnets with no rare-earth contents, with larger energy product by comparison with currently used ferrites. For this purpose we developed nano-sized hard-type/soft-type composite ferrite in which high remanent magnetization (Mr) and high coercivity (Hc). Nano-sized Ba-ferrite, Ni-Zn ferrite and composite ferrites were prepared by sol-gel combustion method by use of glicine-nitrate and citric acid. Nanocomposite ferrites were calcined at temperature range for 1h. According to the X-ray diffraction patterns and FT-IR spectra, single phase of NiZn-ferrite and Ba-ferrite were detected and hard/soft nanocomposite ferrite was indicated to the coexistence of the magnetoplumbite-structural and spinel-structural that agreed with the standard JCPDS 10-0325 data. The particle size of nanocomposite turn out to be less than 120 nm. The nanocomposite ferrite shows a single-phase magnetization behavior, implying that the hard magnetic phase and soft magnetic phase were well exchange-coupled. The specific saturation magnetization () of the nanocomposite ferrite is located between hard () and soft ferrite(). The remanence (Mr) of nanocomposite ferrite is much higher than that of the individual and ferrite, and is increased slightly.
Exchange-coupling;Glycine-nitrate;Citrate precursor;Ba-ferrite;Nanocomposite ferrite;
 Cited by
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