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One-step solution fabrication of magnetic chains consisting of jingle-bell-shaped cobalt mesospheres

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9 Author(s)
Liang, Fang ; School of Materials Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, People’s Republic of China ; Lin Guo ; Qunpeng Zhong ; Wen, Xiaogang
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Using a one-step solution phase approach, the authors have synthesized uniform jingle bell-shaped cobalt mesopheres (550–750 nm) and assembled the mesospheres into long magnetic chains (20–30 μm). All of the cobalt spheres are hollow with ∼40 nm thick shells but each contains an ∼200 nm diameter solid ball. The nano- to mesoscale structures were realized via reaction of CoCl2∙6H2O and N2H4H2O in the presence of polyvinylpyrrolidone (PVP) in an ethylene glycol solution. Magnetic measurements show a coercivity of about 75 Oe with a remnance of 9.6 emu/g at 300 K. We propose a possible mechanism for the formation of the nanoto mesoscale structures.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 10 )

Date of Publication:

Sep 2006

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