Observation of iron diffusion in the near-surface region of magnetite at 470 K

Tober, Steffen; Lott, Dieter; Koutsioubas, Alexandros; Creutzburg, Marcus; Mattauch, Stefan; Volgger, Lukas; Vonk, Vedran; Mohd, Amir Syed; Pütter, Sabine; Stierle, Andreas; Hutter, Herbert; Krausert, Konstantin; Arndt, Björn; Noei, Heshmat

doi:10.1103/PhysRevResearch.2.023406

Journal Article

FZJ-2020-02454

Observation of iron diffusion in the near-surface region of magnetite at 470 K

Tober, S. (First author)DESY* ; Creutzburg, M.DESY* ; Arndt, B.DESY* ; Krausert, K.DESY* ; Mattauch, S.FZJ* ; Koutsioubas, A.FZJ* ; Pütter, S.FZJ* ; Mohd, A. S.FZJ* ; Volgger, L.Extern* ; Hutter, H. ; Noei, H. ; Vonk, V.DESY* ; Lott, D.Extern* ; Stierle, A. (Corresponding author)DESY*

2020
APS College Park, MD

Physical review research 2(2), 023406 (2020) [10.1103/PhysRevResearch.2.023406]

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Please use a persistent id in citations: http://hdl.handle.net/2128/25343 doi:10.1103/PhysRevResearch.2.023406

Abstract: Experiments are reported, which allow us to quantify the near-surface cation diffusion in (001) oriented Fe$_3$O$_4$ single crystals at temperatures between 470 and 770 K. Thin homoepitaxial films of magnetite, grown using isotopically labeled $^{57}$Fe, were investigated by neutron reflectivity and time-of-flight secondary ion mass spectrometry. By heating the thin films in high vacuum to different temperatures for a well-defined time and determining the ${57}$ Fe distribution along the surface normal, the diffusion lengths are obtained. For the investigated temperature range, diffusion constants of the order of 10$^{−20}$ m$^2$/s are deduced. These results are important in view of near-surface mass transport induced by oxygen chemical potential differences occurring when magnetite is exposed to different gas atmospheres or by adsorbates.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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