Surface magnetic states of Ni nanochains modified by using different organic surfactants

Details Surface magnetic states of Ni nanochains modified by using different organic surfactants Surface magnetic states of Ni nanochains modified by using different organic surfactants

2010-01-02

arxiv.org/abs/1001.0298v1

J. Phys.: Condense. Matter 22(12), 126003 (2010)

Physics

Condensed Matter

Materials Science

23 pages, 6 figures included

Scientific paper

Three powder samples of Ni nanochains formed of polycrystalline Ni nanoparticles with an estimated diameter of about 30 nm have been synthesized by a wet chemical method using different organic surfactants. These samples, having magnetically/structurally core-shell structures, all with a ferromagnetic Ni core, are Ni@Ni3C nanochains, Ni@NiSG nanochains with a spin glass (SG) surface layer, and Ni@NiNM nanochains with a nonmagnetic (NM) surface layer. The average thickness of the shell for these three samples is determined as about 2 nm. Magnetic properties tailored by the different surface magnetism are studied. In particular, suppression in saturation magnetization usually observed with magnetic nanoparticles is revealed to arise from the surface magnetic states with the present samples.

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