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@ARTICLE{Zkutn:878132,
      author       = {Zákutná, Dominika and Nižňanský, Daniel and Barnsley,
                      Lester C. and Babcock, Earl and Salhi, Zahir and Feoktystov,
                      Artem and Honecker, Dirk and Disch, Sabrina},
      title        = {{F}ield {D}ependence of {M}agnetic {D}isorder in
                      {N}anoparticles},
      journal      = {Physical review / X Expanding access},
      volume       = {10},
      number       = {3},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2020-02650},
      pages        = {031019},
      year         = {2020},
      abstract     = {The performance characteristics of magnetic nanoparticles
                      toward application, e.g., in medicine and imaging or as
                      sensors, are directly determined by their magnetization
                      relaxation and total magnetic moment. In the commonly
                      assumed picture, nanoparticles have a constant overall
                      magnetic moment originating from the magnetization of the
                      single-domain particle core surrounded by a surface region
                      hosting spin disorder. In contrast, this work demonstrates
                      the significant increase of the magnetic moment of ferrite
                      nanoparticles with an applied magnetic field. At low
                      magnetic field, the homogeneously magnetized particle core
                      initially coincides in size with the structurally coherent
                      grain of 12.8(2) nm diameter, indicating a strong coupling
                      between magnetic and structural disorder. Applied magnetic
                      fields gradually polarize the uncorrelated, disordered
                      surface spins, resulting in a magnetic volume more than
                      $20\%$ larger than the structurally coherent core. The
                      intraparticle magnetic disorder energy increases sharply
                      toward the defect-rich surface as established by the field
                      dependence of the magnetization distribution. In
                      consequence, these findings illustrate how the nanoparticle
                      magnetization overcomes structural surface disorder. This
                      new concept of intraparticle magnetization is deployable to
                      other magnetic nanoparticle systems, where the in-depth
                      knowledge of spin disorder and associated magnetic
                      anisotropies are decisive for a rational nanomaterials
                      design.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000552226600001},
      doi          = {10.1103/PhysRevX.10.031019},
      url          = {https://juser.fz-juelich.de/record/878132},
}