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@ARTICLE{Zakutna:826365,
      author       = {Zakutna, D. and Matulkova, I. and Kentzinger, E. and
                      Medlin, R. and Su, Y. and Disch, S. and Vejpravova, J. and
                      Niznansky, D. and Nemkovskiy, Kirill},
      title        = {{D}ispersible cobalt chromite nanoparticles: facile
                      synthesis and size driven collapse of magnetism},
      journal      = {RSC Advances},
      volume       = {6},
      number       = {109},
      issn         = {2046-2069},
      address      = {London},
      publisher    = {RSC Publishing},
      reportid     = {FZJ-2017-00593},
      pages        = {107659 - 107668},
      year         = {2016},
      abstract     = {Multiferoic oxides have enormous application potential
                      thanks to the mutually coupled magnetic and dielectric
                      response embedded in a standalone material. Among them, the
                      unique case is the cobalt chromite with spin-induced
                      electric polarization locked to the magnetization direction
                      and propagation vector of the spiral magnetic phase. The
                      nature of the ground state magnetic structure gives rise to
                      complex size dependent magnetic behaviour, which collapses
                      when reaching a critical particle size. In our work, we
                      focused on preparation of standalone cobalt chromite
                      nanoparticles (NPs). We introduced hydrothermal
                      decomposition of cobalt(II)/chromium(III) oleates in a
                      water/ethanol system without need of additional thermal
                      treatment, which lead to stable cobalt chromite
                      nanoparticles with diameter of 3.0(1)–4.2(1) nm and log
                      normal size distribution of $12–16\%.$ The size at the
                      edge of the critical limit was tuned by the reaction
                      temperature reaching typically 240 ± 10 °C. The
                      as-prepared NPs are coated with covalently bonded oleic acid
                      and can be easily dispersed in non-polar solvents, which
                      makes them excellent candidates for custom surface
                      modifications. The NPs were studied using a large number of
                      characterization techniques: powder X-ray diffraction,
                      transmission electron microscopy, small-angle X-ray
                      scattering, and vibrational spectroscopies. The impact of
                      the size effect on the magnetic properties was also
                      investigated by temperature and magnetic field dependent
                      magnetization, a.c. susceptibility and diffuse neutron
                      scattering. The onset of the collective glassy state due to
                      the collapse of long range conical magnetic order was
                      observed. The uniform cobalt chromite NPs coated with oleic
                      acid with size of 3–4 nm are excellent prototypes for
                      studying the size effect on magnetic (and feroic) materials,
                      and can be subjected to manifold surface functionalization
                      required for their embedding in smart nanostructures and
                      nanocomposites.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {540},
      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:000389342400066},
      doi          = {10.1039/C6RA21377D},
      url          = {https://juser.fz-juelich.de/record/826365},
}