TY  - CONF
AU  - Lott, Dieter
AU  - Vonk, Vedran
AU  - Creutzburg, Marcus
AU  - Syed Mohd, Amir
AU  - Pütter, Sabine
AU  - Koutsioumpas, Alexandros
AU  - Mattauch, Stefan
AU  - Stierle, Andreas
TI  - Diffusion of iron in the near-surface region of magnetite (001)
M1  - FZJ-2019-00421
PY  - 2018
AB  - 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)
T2  - German Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities
CY  - 17 Sep 2019 - 19 Sep 2019, Garching (Germany)
Y2  - 17 Sep 2019 - 19 Sep 2019
M2  - Garching, Germany
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/859569
ER  -