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Template-based multiwalled TiO2/iron oxides nanotubes: Structure and magnetic properties

J. Appl. Phys. 106, 084313 (2009); doi:10.1063/1.3245395

Published 23 October 2009

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I. L. Soroka,1 M. Rooth,1 Jun Lu,2 M. Boman,1 P. Svedlindh,2 J.-O. Carlsson,1 and A. Hårsta1
1Department of Materials Chemistry, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden
2Department of Engineering Science, Uppsala University, Box 534, S-751 21 Uppsala, Sweden
Double- and triple-walled TiO2/iron oxide nanotubes with well defined interfaces have been produced in nanoporous alumina templates using atomic layer deposition method. The structural properties of each individual layer are found to be dependent on the deposition temperatures. The outer layers of TiO2 are polycrystalline and consist of a phase mixture of anatase and rutile, while the inner TiO2 layers grown at lower temperature are amorphous. The iron oxide layers consist of pure hematite when deposited at 500 °C, while a phase mixture of hematite and magnetite was obtained at 400 °C. The magnetization measurements reveal that the studied nanotubes exhibit weak ferromagnetic behavior and magnetic anisotropy with an easy axis perpendicular to the tube axis. ©2009 American Institute of Physics
History: Received 14 May 2009; accepted 16 September 2009; published 23 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/084313/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.46.Fg
    Structure of nanotubes
  • 81.07.De
    Nanotubes: fabrication and characterization
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Gw
    Magnetic anisotropy
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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