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@ARTICLE{GroudevaZotova:57170,
      author       = {Groudeva-Zotova, S. and Kozhuharova, R. and Elefant, D. and
                      Mühl, T. and Schneider, C. M. and Mönch, I.},
      title        = {{P}hase composition and magnetic characteristics of
                      {F}e-filled multi-walled carbon nanotubes},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {306},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {PreJuSER-57170},
      pages        = {40 - 50},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The work addresses the correlation between the phase
                      composition and the magnetic characteristics of aligned
                      Fe-filled multi-walled carbon nanotubes (Fe-MWCNTs) grown by
                      pyrolysis of ferrocene on oxidized Si substrates. In a
                      combinatorial approach we exploited the extremely high
                      gradients of the technological parameters temperature and
                      ferrocene flow across the surface of a substrate positioned
                      close to the reactor wall to obtain a large variation in the
                      structural and magnetic properties of the Fe-MWCNTs. In this
                      way, we established several clear correlations between the
                      Fe-filling phase composition and the overall magnetic
                      characteristics of the aligned Fe-MWCNTs. The alpha-Fe rich
                      samples, which possess a more ordered graphitic sheet
                      structure, a higher degree of preferred crystalline
                      orientation of the metal filling and much larger metal
                      crystallites in comparison with the carbide-rich samples,
                      show a much stronger magnetic anisotropy with easy axis
                      perpendicular to the substrate and unusually high values of
                      the coercive field H-c and the saturation field H-s. The
                      changes in the measured saturation magnetisation M-s and the
                      H-c values correlate well with the variation of the alpha-Fe
                      content and the filling crystallinity. A special annealing
                      treatment of the samples causes a distinct increase of the
                      alpha-Fe quantity and an increase of the measured average
                      grain size. The respective magnetic characteristics show a
                      significant increase of the overall magnetic moment and
                      decrease of the coercive field. The correlation between the
                      structural and the magnetic characteristics of the annealed
                      samples matches quite well the respective correlations in
                      the case of as-deposited samples. (C) 2006 Elsevier B.V. All
                      rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IFF-IEE / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB38 / $I:(DE-82)080009_20140620$},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Materials Science, Multidisciplinary / Physics, Condensed
                      Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000240760800007},
      doi          = {10.1016/j.jmmm.2006.02.103},
      url          = {https://juser.fz-juelich.de/record/57170},
}