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@ARTICLE{Zkutn:1005345,
      author       = {Zákutná, Dominika and Rouzbeh, Nahal and Nižňanský,
                      Daniel and Duchoň, Jan and Qdemat, Asmaa and Kentzinger,
                      Emmanuel and Honecker, Dirk and Disch, Sabrina},
      title        = {{M}agnetic {C}oupling in {C}obalt-{D}oped {I}ron {O}xide
                      {C}ore–{S}hell {N}anoparticles: {E}xchange {P}inning
                      through {E}pitaxial {A}lignment},
      journal      = {Chemistry of materials},
      volume       = {35},
      number       = {6},
      issn         = {0897-4756},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2023-01451},
      pages        = {2302-2311},
      year         = {2023},
      abstract     = {Tuning the core–shell morphology of bimagnetic
                      nanoparticles and its associated exchange bias behavior is a
                      promising way to overcome the superparamagnetic limit and
                      stabilize the particle moment in extended time and
                      temperature ranges. The intraparticle magnetization
                      distribution and magnetic coupling between the two phases,
                      however, is still unclear. We report a significant nonzero
                      magnetization in the CoxFe(1–x)O core of native
                      core–shell bimagnetic nanoparticles that is typically
                      considered antiferro- or paramagnetic.
                      Co0.14Fe0.86O@Co0.4Fe2.4O4 (6 nm@2 nm) and
                      Co0.08Fe0.92O@Co0.58Fe2.28O4 (12 nm@2 nm) core–shell
                      nanoparticles have been synthesized by thermal decomposition
                      of a mixed cobalt–iron oleate with a similar Fe/Co
                      distribution throughout the nanoparticle. We determine the
                      exact phase composition and the magnetization distribution
                      in the core and shell using a combination of X-ray and
                      neutron small-angle scattering. Core and shell magnetization
                      are traced separately with a varying magnetic field. Our
                      results reveal that the magnetization of the core and the
                      spinel-type shell phases are coupled at room temperature,
                      i.e., rotating coherently with the magnetic field. This is a
                      mandatory condition to observe a significant exchange bias
                      effect at low temperatures. These findings highlight the
                      enormous potential of finite size and exchange coupling in
                      bimagnetic nanoparticles to control the magnetic properties
                      via interface-induced magnetization.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000948742400001},
      doi          = {10.1021/acs.chemmater.2c02813},
      url          = {https://juser.fz-juelich.de/record/1005345},
}