This title appears in the Scientific Report :
2018
Diffusion of iron in the near-surface region of magnetite (001)
Diffusion of iron in the near-surface region of magnetite (001)
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 scan...
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Personal Name(s): | Lott, Dieter (Corresponding author) |
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Vonk, Vedran / Creutzburg, Marcus / Syed Mohd, Amir / Pütter, Sabine / Koutsioumpas, Alexandros / Mattauch, Stefan / Stierle, Andreas | |
Contributing Institute: |
Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Imprint: |
2018
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Conference: | German Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities, Garching (Germany), 2019-09-17 - 2019-09-19 |
Document Type: |
Conference Presentation |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): | |
Publikationsportal JuSER |
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) |