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Sci Rep. 2015 Oct 13;5:15033. doi: 10.1038/srep15033.

Nickel clusters embedded in carbon nanotubes as high performance magnets.

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Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
Nanomaterials Research Institute, AIST, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria.
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany.


Ensembles of fcc nickel nanowires have been synthesized with defined mean sizes in the interior of single-wall carbon nanotubes. The method allows the intrinsic nature of single-domain magnets to emerge with large coercivity as their size becomes as small as the exchange length of nickel. By means of X-ray magnetic circular dichroism we probe electronic interactions at nickel-carbon interfaces where nickel exhibit no hysteresis and size-dependent spin magnetic moment. A manifestation of the interacting two subsystems on a bulk scale is traced in the nanotube's magnetoresistance as explained within the framework of weak localization.

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