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@ARTICLE{Sun:829533,
      author       = {Sun, X. and Klapper, A. and Su, Y. and Nemkovski, K. and
                      Wildes, A. and Bauer, H. and Köhler, O. and Schilmann, A.
                      and Tremel, W. and Petracic, O. and Brückel, Th.},
      title        = {{M}agnetism of monomer {M}n{O} and heterodimer
                      {F}e{P}t@{M}n{O} nanoparticles},
      journal      = {Physical review / B},
      volume       = {95},
      number       = {13},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-03218},
      pages        = {134427},
      year         = {2017},
      abstract     = {We report about the magnetic properties of
                      antiferromagnetic (AF) MnO nanoparticles (NPs) with
                      different sizes (6–19 nm). Using a combination of
                      polarized neutron scattering and magnetometry, we were able
                      to resolve previously observed peculiarities. Magnetometry,
                      on the one hand, reveals a peak in the zero-field-cooled
                      (ZFC) magnetization curves at low temperatures (∼25 K) but
                      no feature around the Néel temperature at 118 K. On the
                      other hand, polarized neutron scattering shows the expected
                      behavior of the AF order parameter vanishing around 118 K.
                      Moreover, hysteresis curves measured at various temperatures
                      reveal an exchange-bias effect, indicating a coupling of an
                      AF core to a ferromagnetic (FM)-like shell. ZFC data
                      measured at various fields exclude a purely
                      superparamagnetic (SPM) scenario. We conclude that the
                      magnetic behavior of MnO particles can be explained by a
                      superposition of SPM-like thermal fluctuations of the
                      AF-Néel vector inside the AF core and a magnetic coupling
                      to a ferrimagnetic Mn2O3 or Mn3O4 shell. In addition, we
                      have studied heterodimer (“Janus”) particles, where a FM
                      FePt particle is attached to the AF MnO particle. Via the
                      exchange-bias effect, the magnetic moment of the FePt
                      subunit is stabilized by the MnO.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      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},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000399789000004},
      doi          = {10.1103/PhysRevB.95.134427},
      url          = {https://juser.fz-juelich.de/record/829533},
}