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The Co0.6Sn0.4Fe2O4 nanoparticles with 20-nm size were prepared by chemical coprecipitation method. The material exhibits wasp-waist type M(H) loop at lower temperatures (below 360 K) that has been attributed to the simultaneous existence of double-exchange and superexchange interactions in these nanoparticles. It has been investigated that at 360 K and above, the double-exchange interactions (Fe3+...
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