MnFe, MnFeCo, MnFeCoNi,and CrMnFeCoNi magnetic nanoparticles are synthesized by superhydride reduction of CrCl3, MnCl2, Fe(acac)2, Co(acac)2 and Ni(acac)2 at high temperature, and nanoparticles are dispersed by oleic acid in hexane. Adding the LiB(Et)3H to the phenyl ether solution of metal precosor in present oleic acid, and 1,2 hexdecanediol at 180℃, followed by refluxing at 250℃, to prepare the multi-element nanoparticle. Anneal the particles at 400℃, 500℃, 600℃ by RTA. The compositional analyses of nanoparticles are performed by EDS of TEM. The crystal structures are decided by XRD, electron diffraction pattern, and HRTEM. The microstructure of annealed particles are observed by SEM. Magnetic properties of nanoparticles are charactered by VSM.

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