Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 44: Poster: Oxide and Insulator surfaces: Structure, Epitaxy, Growth and Adsorption
O 44.3: Poster
Tuesday, March 13, 2018, 18:15–20:30, Poster A
Ni on Fe3O4: Post deposition annealing treatments and Ni diffusion into Fe3O4 — •Andreas Alexander, Martin Hoppe, Joachim Wollschläger, and Karsten Küpper — Fachbereich Physik, Universität, Barbarastr. 7, 49076 Osnabrück, Germany
One approach of preparing the magnetic insulating ferrite NiFe2O4 is the interdiffusion of Fe3O4/NiO bilayers [1]. Very recently, it has been demonstrated that the surface properties of spinel ferrites can be precisely controlled by diffusion of metallic Co into Fe3O4 [2]. Here we study the diffusion of metallic Ni into Fe3O4. We have grown Ni/Fe3O4 by reactive molecular beam epitaxy (RMBE) on SrTiO3(001). Then the samples were post-deposition annealed (PDA) at three different temperatures, i.e. 400∘C, 500∘C, and 700∘C, in UHV and 10−4 mbar O2 to tackle the diffusion process. The structural surface characterization was performed by low energy electron diffraction (LEED) after each PDA step, whereas x-ray photoelectron spectroscopy (XPS) was employed to investigate the surface chemical composition. In order to gain information about the Ni incorporation into the bulk of the magnetite layer, we employed hard x-ray photoelectron spectroscopy (HAXPES) due to its enhanced electron escape depth. HAXPES was performed at the beamline I09 of DLS.
[1] O. Kuschel et al., Phys. Rev. B 94, 094423 (2016).
[2] R. Gargallo-Caballero et al., J. Chem. Phys. 144, 094704 (2016.)