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In order to improve the performance of magnetically coupled material, this paper illustrates the synthesis of Core-shell magnetic nanoparticle exploiting microwave plasma. Result shows that the core w is comprised of pure Fe and shell is comprised of ferric oxide .The radius and thickness of core is about 8nm and 2nm respectively. Obtained nanoparticle shows great dispersity. The result of mathematical model calculation which obtained from Core-shell magnetic particle is consistent with the experiment result