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Co nanoparticle films were prepared by plasma-gas-condensation-type particle beam deposition system. High-resolution transmission electron microscopy images show that the Co nanoparticles have a very narrow size distribution with an average diameter of ~20nm, and each of the Co nanoparticles is covered with an ~3nm layer of CoO. Hysteresis loops of the films after field-cooling in a 5T magnetic field...
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