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@PHDTHESIS{Josten:201355,
      author       = {Josten, Elisabeth},
      title        = {{L}ong range order in 3{D} nanoparticle assemblies},
      volume       = {111},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2015-03652},
      isbn         = {978-3-95806-087-6},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {238 S.},
      year         = {2015},
      note         = {RWTH Aachen, Diss., 2014},
      abstract     = {Magnetic nanoparticles and their assembly in highly
                      correlated structures are of great interest for future
                      applications as e.g. spin-based data storage. These systems
                      are not only distinguished by the obvious miniaturization
                      but by the novel physical properties emerging due to their
                      limited size and ordered arrangement, as well. The
                      superstructures are formed from nanometer sized building
                      blocks, ordered like atoms in a crystal, which renders them
                      a newclass of materials. To gain a profound understanding of
                      these systems it is necessary to perform experiments on all
                      length scales. The present work supplies an extensive and
                      novel contribution to the investigation of the structural
                      properties and the self-assembly of iron oxide nanoparticle
                      superstructures. The unique combination of microscopy and
                      scattering techniques allows a new understanding of the
                      structural features of three dimensional structures that
                      develop from the self-organization of these particles. In
                      this thesis, magnetic nanoparticles have been deposited for
                      this purpose using a self organization method to form long
                      range ordered structures, so called mesocrystals. The
                      processof self-assembling has been investigated for the
                      influence of different deposition parameters and these
                      parameters have been optimized. An in-situ study using
                      grazing incidence x-ray scattering during the growth of the
                      mesocrystals allowed the identification of different stages
                      of the mesocrystal growth and its spatial position. From the
                      combination of these different experiments it was possible
                      to establish a model for the growth process governed by a
                      shape and size selective arrangement of the particles.
                      Another highlight of this work is the measurement on a
                      single mesocrystal, which had only a volume of 2.5
                      $\mu$m$^{3}$, leading to a challenging diffraction
                      experiment. It was possible to extract structural quality
                      parameters from this investigation, as e.g. the mosaicity,
                      which would normally be masked by the distribution of the
                      orientation and lattice parameters generally present in the
                      normal samples that contain a large number of mesocrystals.
                      A detailed analysis of the scattering patterns of different
                      samples with mesocrystal ensembles yielded a refined
                      structure model, which allowed the quantitative analysis of
                      the data collected as well for in-situ created as for
                      already deposited samples. In addition, a new rounded cubes
                      form factor was developed for the modeling of small angle
                      x-ray scattering and the single mesocrystal diffraction
                      data. In conclusion, this work shows the large correlation
                      in these nanoparticle superstructures, the distribution of
                      different structural parameters that can be present in the
                      samples and how much information can be extracted from the
                      scattering patterns.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6213 - Materials
                      and Processes for Energy and Transport Technologies
                      (POF3-621) / 6G4 - Jülich Centre for Neutron Research
                      (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6213 / G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/201355},
}