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@ARTICLE{Wetterskog:151434,
      author       = {Wetterskog, E. and Disch, Sabrina and Podlesnyak, A. A. and
                      An, K. and Hyeon, T. and Salazar-Alvarez, G. and Bergström,
                      L. and Brückel, Th. and Hermann, Raphael},
      title        = {{S}pin excitations in cubic maghemite nanoparticles studied
                      by time-of-flight neutron spectroscopy},
      journal      = {Physical review / B},
      volume       = {89},
      number       = {6},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2014-01382},
      pages        = {064402},
      year         = {2014},
      abstract     = {We have determined the field dependence of collective
                      magnetic excitations in iron oxide nanoparticles of cubic
                      shape with 8.42(2) nm edge length and a narrow log normal
                      size distribution of $8.2(2)\%$ using time-of-flight neutron
                      spectroscopy. The energy dependence of the uniform
                      precession modes was investigated up to 5 T applied field
                      and yields a Landé factor g=2.05(2) as expected for
                      maghemite (γ-Fe2O3) nanoparticles. A large effective
                      anisotropy field of BA,eff=0.45(16) T was determined, in
                      excellent agreement with macroscopic measurements. This
                      anisotropy is attributed to enhanced shape anisotropy in
                      these monodisperse cubic nanoparticles. The combination of
                      our results with macroscopic magnetization information
                      provides a consistent view of the energy scales of
                      superparamagnetic relaxation and collective magnetic
                      excitations in magnetic nanoparticles.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000332370200003},
      doi          = {10.1103/PhysRevB.89.064402},
      url          = {https://juser.fz-juelich.de/record/151434},
}