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Title: Large scale growth and magnetic properties of Fe and Fe{sub 3}O{sub 4} nanowires

Abstract

Fe and Fe{sub 3}O{sub 4} nanowires have been synthesized by thermal decomposition of Fe(CO){sub 5}, followed by heat treatments. The Fe wires are formed through the aggregation of nanoparticles generated by decomposition of Fe(CO){sub 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 Fe{sub 2}O{sub 3}/Fe{sub 3}O{sub 4} wires, which after heat treatment in a N{sub 2}/alcohol atmosphere form Fe{sub 3}O{sub 4} wires with a sharp Verwey [Nature (London) 144, 327 (1939)] transition at 125 K. The Fe{sub 3}O{sub 4} 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.

Authors:
; ; ; ; ; ;  [1];  [2];  [3];  [4];  [3]
  1. Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409 (United States)
  2. (Singapore)
  3. (United States)
  4. (China)
Publication Date:
OSTI Identifier:
20788148
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 99; Journal Issue: 8; Other Information: DOI: 10.1063/1.2172208; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AFTER-HEAT; AGGLOMERATION; AIR; ALCOHOLS; ANISOTROPY; ANNEALING; ATMOSPHERES; COERCIVE FORCE; CRYSTAL GROWTH; FERROMAGNETIC MATERIALS; IRON; IRON OXIDES; MAGNETIC PROPERTIES; PARTICLES; PYROLYSIS; QUANTUM WIRES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Yang, J. B., Xu, H., You, S. X., Zhou, X. D., Wang, C. S., Yelon, W. B., James, W. J., Physics Department, National University of Singapore, Singapore 117542, Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409, School of Physics, Peking University, Beijing 100871, and Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409. Large scale growth and magnetic properties of Fe and Fe{sub 3}O{sub 4} nanowires. United States: N. p., 2006. Web. doi:10.1063/1.2172208.
Yang, J. B., Xu, H., You, S. X., Zhou, X. D., Wang, C. S., Yelon, W. B., James, W. J., Physics Department, National University of Singapore, Singapore 117542, Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409, School of Physics, Peking University, Beijing 100871, & Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409. Large scale growth and magnetic properties of Fe and Fe{sub 3}O{sub 4} nanowires. United States. doi:10.1063/1.2172208.
Yang, J. B., Xu, H., You, S. X., Zhou, X. D., Wang, C. S., Yelon, W. B., James, W. J., Physics Department, National University of Singapore, Singapore 117542, Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409, School of Physics, Peking University, Beijing 100871, and Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409. Sat . "Large scale growth and magnetic properties of Fe and Fe{sub 3}O{sub 4} nanowires". United States. doi:10.1063/1.2172208.
@article{osti_20788148,
title = {Large scale growth and magnetic properties of Fe and Fe{sub 3}O{sub 4} nanowires},
author = {Yang, J. B. and Xu, H. and You, S. X. and Zhou, X. D. and Wang, C. S. and Yelon, W. B. and James, W. J. and Physics Department, National University of Singapore, Singapore 117542 and Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409 and School of Physics, Peking University, Beijing 100871 and Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65409},
abstractNote = {Fe and Fe{sub 3}O{sub 4} nanowires have been synthesized by thermal decomposition of Fe(CO){sub 5}, followed by heat treatments. The Fe wires are formed through the aggregation of nanoparticles generated by decomposition of Fe(CO){sub 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 Fe{sub 2}O{sub 3}/Fe{sub 3}O{sub 4} wires, which after heat treatment in a N{sub 2}/alcohol atmosphere form Fe{sub 3}O{sub 4} wires with a sharp Verwey [Nature (London) 144, 327 (1939)] transition at 125 K. The Fe{sub 3}O{sub 4} 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.},
doi = {10.1063/1.2172208},
journal = {Journal of Applied Physics},
number = 8,
volume = 99,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}