title: Nickel clusters embedded in carbon nanotubes as high performance magnets.
abstract: 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.
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Hidetsugu
authors.initials: H
authors.lastname: Shiozawa
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Antonio
authors.initials: A
authors.lastname: Briones-Leon
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Oleg
authors.initials: O
authors.lastname: Domanov
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Georg
authors.initials: G
authors.lastname: Zechner
authors.affiliation: Nanomaterials Research Institute, AIST, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Sato
authors.affiliation: Nanomaterials Research Institute, AIST, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
authors.forename: Kazu
authors.initials: K
authors.lastname: Suenaga
authors.affiliation: Nanomaterials Research Institute, AIST, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Saito
authors.affiliation: Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: Michael
authors.initials: M
authors.lastname: Eisterer
authors.affiliation: Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
authors.forename: Eugen
authors.initials: E
authors.lastname: Weschke
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Lang
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Herwig
authors.initials: H
authors.lastname: Peterlik
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Pichler