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Nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been prepared by the sol-gel method and their structure and magnetic properties have been analyzed by x-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. When thermal treatment temperature is below 800 °C, the samples pressed into a flake exhibit exchange-coupling interaction between the two nanostructured phases of γ-Fe2O3 and SrFe12O19. The flake sample treated at 800 °C produces an isotropic nanocomposite with a intrinsic coercivity of 6015 Oe, a maximum magnetization of 75.6 emu/g and a maximum energy product of 1.87 MGOe as compared with the powder sample of 6400 Oe, 75.9 emu/g, and 1.52 MGOe, respectively. The exchange-coupling interaction and the enhancement of isotropic (BH)max in nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been discussed.
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Liu et al. (2002) studied this question.
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