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Graphite-coated Fe nanocapsules were prepared by arc discharge method. Fe nanocapsules have a core/shell microstructure, in which Fe nanoparticles as cores and graphite layers as shells. Compared with Fe nanoparticles with an oxide shell, the graphite shell can restrain the growth of Fe nanoparticles, which leads to lower saturation magnetization and higher natural resonance frequency. The Fe nanocapsules...
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