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@INPROCEEDINGS{Lott:859569,
      author       = {Lott, Dieter and Vonk, Vedran and Creutzburg, Marcus and
                      Syed Mohd, Amir and Pütter, Sabine and Koutsioumpas,
                      Alexandros and Mattauch, Stefan and Stierle, Andreas},
      title        = {{D}iffusion of iron in the near-surface region of magnetite
                      (001)},
      reportid     = {FZJ-2019-00421},
      year         = {2018},
      abstract     = {The mobility of Fe in magnetite is a key ingredient towards
                      a better understanding of its defect structure and resulting
                      properties. For nanoparticles, which find a range of
                      applications in medicine, spintronics, material science and
                      catalysis, the near-surface is particularly important.
                      Recent scanning tunnelling microscopy (STM) and low energy
                      electron dif- fraction (LEED) studies of the ( √2×
                      √2)R45° reconstructed (001) surface suggested a
                      subsurface vacancy stabilisation model for this surface,
                      later proved by surface x-ray diffraction (SXRD) [1,2]. Low
                      energy electron microscopy (LEEM) experiments under
                      catalytic conditions showed a regrowth process of
                      Fe3O4-layers on (001) surfaces [3]. These results point
                      towards an interesting interplay between cation vacancy
                      formation and diffusion. We present the results of iron
                      exchange at the interface between 57Fe3O4 thin-films and a
                      Fe3O4 (001) substrate after ultra high vacuum annealing at
                      multiple temperatures. By exploiting the scattering length
                      variation of 57Fe and natural Fe, its interdiffusion across
                      the film-substrate interface is characterized by neutron
                      reflectometry at MARIA at MLZ [4]. The results on growth and
                      diffusion are complemented by x-ray reflectometry data.[1]
                      Bliem, R. et al. Science. 346, 1215 (2014)[2] Arndt, B. et
                      al. Surf. Sci. 653, 76 (2016)[3] Nie, S. et al., J. Am.
                      Chem. Soc. 135, 10091 (2013) [4] Schmidt, H. et al. Adv.
                      Eng. Mat. 11, 446 (2009)},
      month         = {Sep},
      date          = {2019-09-17},
      organization  = {German Conference for Research with
                       Synchrotron Radiation, Neutrons and Ion
                       Beams at Large Facilities, Garching
                       (Germany), 17 Sep 2019 - 19 Sep 2019},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210 / EXP:(DE-MLZ)MARIA-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/859569},
}