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@INPROCEEDINGS{SUN:873839,
      author       = {SUN, XIAO and DIPPEL, ANN-CHRISTIN and ULLRICH, ALADIN and
                      PETRACIC, OLEG and BRÜCKEL, THOMAS},
      title        = {{T}uning the structural and magnetic properties of
                      transition metal oxide nanoparticles},
      reportid     = {FZJ-2020-01041},
      year         = {2020},
      abstract     = {Magnetic nanoparticles (NPs) have attracted interests in
                      both fundamental research and industry. We focus on two
                      transition metal oxide systems: manganese oxide and iron
                      oxide. The structural information of the particles was
                      characterized using X-ray powder diffraction, total
                      scattering experiments with pair distribution function
                      analysis, small angle scattering as well as scanning
                      electron microscopy. The magnetic properties were studied
                      using a SQUID magnetometer. In the hysteresis loops of the
                      as-prepared NPs an exchange bias effect is found. By
                      comparing hysteresis loops cooled at different magnetic
                      fields, a hardening effect is observed, i.e. the squareness
                      and hardness of hysteresis loops is significantly enhanced
                      with increasing magnetic cooling field. By varying the
                      oxygen content inside the NPs via different annealing
                      procedures, their crystallographic structures change. The
                      bonding lengths as well as the correlation lengths of
                      different phases in the particles are obtained using total
                      scattering with pair distribution function analysis. The
                      relationship between the correlation lengths and the
                      exchange bias as well as the magnetic hardening effects is
                      elucidated.},
      month         = {Mar},
      date          = {2020-03-15},
      organization  = {DPG-Frühjahrstagung der Sektion
                       Kondensierte Materie (SKM), Technischen
                       Universität Dresden, Campus
                       Südvorstadt (Germany), 15 Mar 2020 -
                       20 Mar 2020},
      subtyp        = {Invited},
      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) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      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)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/873839},
}