Abstract
Three powder samples of Ni nanochains formed of polycrystalline Ni nanoparticleswith an estimated diameter of about 30 nm have been synthesized by a wetchemical method using different organic surfactants. These samples, havingmagnetically/structurally core–shell structures, all with a ferromagnetic Ni core, areNi@Ni3C nanochains,Ni@NiSG nanochains with a spin glass (SG) surface layer, andNi@NiNM nanochains with a nonmagnetic (NM) surface layer. The average thickness of the shell forthese three samples is determined as about 2 nm. Magnetic properties tailored by thedifferent surface magnetism are studied. In particular, suppression in the saturationmagnetization, usually observed with magnetic nanoparticles, is revealed to arise from thesurface magnetic states with the present samples.
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