TITLE:
Synthesis, Structure and Magnetic Properties of CoNi Submicrospherical Chains
AUTHORS:
Yajing Zhang, Siu-Wing Or, Zhidong Zhang
KEYWORDS:
Chain-Like Assembles, CoNi, Magnetic Properties, Morphology, Solvothermal Route, Submicrospherical Chains
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.1 No.2,
September
30,
2011
ABSTRACT: High-purity magnetic CoNi submicrospherical chains, each of length 20 μm - 30 μm and self-assembled from fcc-phase CoNi submicrospheres of average diameter 800 nm, are synthesized via a surfactant-assisted solvothermal route without the aid of nucleation agent. The effects of surfactant and reducing agent on the morphology and size of the CoNi chains are studied, and a possible growth mechanism for the CoNi chains is proposed. The CoNi chains show ferromagnetic characteristics with a similarly small saturation magnetization of 104.1 emu/g and a larger coercivity of 150 Oe at room temperature compared to the monodispersed CoNi submicrospheres of 105 emu/g and 34 Oe as a result of the increased shape anisotropy.