Abstract
Fe and Fe3O4 nanowires have been synthesized by thermal decomposition of Fe(CO)5, followed by heat treatments. The Fe wires are formed through the aggregation of nanoparticles generated by decomposition of Fe(CO)5. A core-shell structure with an iron oxide shell and Fe core is observed for the as-prepared Fe wires. Annealing in air leads to the formation of Fe2O3/Fe3O4 wires, which after heat treatment in a N2/alcohol atmosphere form Fe3O4 wires with a sharp Verwey [Nature (London) 144, 327 (1939)] transition at 125 K. The Fe3O4 wires have coercivities of 261 and 735 Oe along the wire axis at RT and 5 K, respectively. The large increase of coercivity at 5 K as compared to RT is due to the increase of anisotropy resulting from the Verwey transition.
Recommended Citation
J. Yang et al., "Large Scale Growth and Magnetic Properties of Fe and Fe₃O₄ Nanowires," Journal of Applied Physics, American Institute of Physics (AIP), Apr 2006.
The definitive version is available at https://doi.org/10.1063/1.2172208
Department(s)
Materials Science and Engineering
Second Department
Physics
Third Department
Chemistry
Sponsor(s)
United States. Department of Energy
Keywords and Phrases
Annealing; Coercive Force; Ferromagnetic Materials; Iron; Iron Compounds; Metal-Insulator Transition; Nanotechnology; Nanowires; Pyrolysis
International Standard Serial Number (ISSN)
0021-8979
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2006 American Institute of Physics (AIP), All rights reserved.
Publication Date
01 Apr 2006
