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@ARTICLE{Bedanta:12842,
      author       = {Bedanta, S. and Petracic, O. and Chen, X. and Rhensius, J.
                      and Kentzinger, E. and Rücker, U. and Brückel, T. and
                      Doran, A. and Scholl, A. and Cardoso, S. and Freitas, S. S.
                      and Kleemann, W.},
      title        = {{S}ingle-particle blocking and collective magnetic states
                      in discontinuous {C}o{F}e/{A}l2{O}3 multilayers},
      journal      = {Journal of physics / D},
      volume       = {43},
      issn         = {0022-3727},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-12842},
      pages        = {474002},
      year         = {2010},
      note         = {The authors like to thank Ch Binek, Th Eimuller, A Paul, Th
                      Kleinefeld and F Stromberg for discussions. Financial
                      supports by the DFG (Graduate School 'Structure and Dynamics
                      of Heterogeneous Systems' and KL306/38) and by the
                      Konrad-Krieger Stiftung are highly appreciated.},
      abstract     = {Discontinuous metal-insulator multilayers (DMIMs) of
                      [CoFe(t(n))/Al2O3](m) containing soft ferromagnetic (FM)
                      Co80Fe20 nanoparticles embedded discontinuously in a
                      diamagnetic insulating Al2O3 matrix are ideal systems to
                      study interparticle interaction effects. Here the CoFe
                      nanoparticles are treated as superspins with random size,
                      position and anisotropy. At low particle density, namely
                      nominal layer thickness t(n) = 0.5 nm, single-particle
                      blocking phenomena are observed due to the absence of large
                      enough interparticle interactions. However at 0.5 nm < t(n)
                      < 1.1 nm, the particles encounter strong interactions which
                      give rise to a superspin glass (SSG) phase. The SSG phase
                      has been characterized by memory effect, ageing, dynamic
                      scaling, etc. With further increase in particle
                      concentration (1.1 nm < t(n) < 1.4 nm) and, hence, smaller
                      interparticle distances, strong interactions lead to a
                      FM-like state which is called superferromagnetic (SFM). The
                      SFM state has been characterized by several techniques, e.
                      g. dynamic hysteresis, Cole-Cole plots extracted from ac
                      susceptibility, polarized neutron reflectometry, etc.
                      Moreover, the SFM domains could be imaged by x-ray
                      photoemission electron microscopy and magneto-optic Kerr
                      effect microscopy. At t(n) > 1.4 nm physical percolation
                      occurs between the particles and the samples are no longer
                      discontinuous and then termed as metal insulating
                      multilayers. Competition between long-and short-ranged
                      dipolar interactions leads to an oscillating magnetization
                      depth profile from CoFe layer to CoFe layer with an
                      incommensurate periodicity.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / JARA-FIT / Jülich Centre for Neutron
                      Science JCNS (JCNS) ; JCNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-20121112},
      pnm          = {Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI) / BioSoft: Makromolekulare Systeme und
                      biologische Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK415 / G:(DE-Juel1)FUEK505},
      shelfmark    = {Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000284099700003},
      doi          = {10.1088/0022-3727/43/47/474002},
      url          = {https://juser.fz-juelich.de/record/12842},
}