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@BOOK{Disch:15530,
      author       = {Disch, Sabrina},
      title        = {{T}he spin structure of magnetic nanoparticles and in
                      magnetic nanostructures},
      volume       = {21},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-15530},
      isbn         = {978-3-89336-704-7},
      series       = {Schriften des Forschungszentrums Jülich.
                      Schlüsseltechnologien / Key Technologies},
      pages        = {V, 342 S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; RWTH Aachen,
                      Diss., 2010},
      abstract     = {The present thesis provides an extensive and original
                      contribution to the investigation of magnetic nanoparticles
                      regarding synthesis and structural characterization using
                      advanced scattering methods in all length scales between the
                      atomic and mesoscopic size range. Particular emphasis is on
                      determination of the magnetic structure of single
                      nanoparticles as well as preparation and characterization of
                      higher dimensional assemblies thereof. The unique physical
                      properties arising from the finite size of magnetic
                      nanoparticles are pronounced for very small particle sizes.
                      With the aim of preparing magnetic nanoparticles suitable
                      for investigation of such properties, a micellar synthesis
                      route for very small cobalt nanoparticles is explored.
                      Cobalt nanoparticles with diameters of less than 3 nm are
                      prepared and characterized, and routes for variation of the
                      particle size are developed. The needs and limitations of
                      primary characterization and handling of such small and
                      oxidation-sensitive nanoparticles are lighlighted and
                      discussed in detail. Comprehensive structural and magnetic
                      characterization is performed on iron oxide nanoparticles of
                      ∼ 10 nm in diameter. Particle size and narrow size
                      distribution are determined with high precision.
                      Investigation of the long range and local atomic structure
                      reveals a particle size dependent magnetite - maghemite
                      structure type with lattice distortions induced at the
                      particle surface. The spatial magnetization distribution
                      within these nanoparticles is determined to be constant in
                      the particle core with a decrease towards the particle
                      surface, thus indicating a magnetic dead layer or spin
                      canting close to the surface. Magnetically induced
                      arrangements of such nanoparticles into higher dimensional
                      assemblies are investigated in solution and by deposition of
                      long range ordered mesocrystals. Both cases reveal a strong
                      dependence of the found structures on the nanoparticle shape
                      (spheres, cubes, and heavily truncated cubes). Nanospheres
                      and nanocubes form closed packed mesocrystals and a short
                      range ordered hard spheres interaction potential in
                      dispersion. In addition, the arrangements of the cuboidal
                      nanoparticles exhibit a strong tendency of face to face
                      oriented attachment, which may result from van der Waals
                      interaction of the cubic facets. Mesocrystals of aged
                      nanocubes with higher degree of truncation reveal a
                      structural transition between the structures of nanocubes
                      and nanospheres.},
      cin          = {PGI-4 / JARA-FIT / JCNS-2},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/15530},
}