Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Poster Wednesday: Surface Structure, Epitaxy and Growth
O 65.8: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B1
Formation of cobalt ferrite by interdiffusion of CoO/Fe 3 O 4 bilayers — •Jannis Thien, Jascha Bahlmann, Andreas Alexander, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany
With their magnetic and electronic properties thin CoFe2O4 (CFO) films are among the most promising candidates for the development of spin filters at room temperature, where spin-polarized electron currents are generated due to the spin-dependent tunnelling barrier. Since the efficiency of spin-filtering greatly depends on the band structure of the material and the presence of defects, the fabrication of these films has to be carefully controlled if efficient spin filters are aimed for. To prepare thin CFO films pulsed laser deposition or sputter deposition is commonly used. Another approach of preparing CFO films might be the interdiffusion of CoO/Fe3O4 bilayers mediated by post-deposition annealing as recently shown for NiFe2O4 using Fe3O4/NiO bilayers.
Therefore, CoO/Fe3O4 bilayers were consecutively grown by reactive molecular beam epitaxy on SrTiO3(001) and post-annealed at different temperatures afterwards. The film structure and chemical properties of the annealed bilayer system have been studied after each annealing step using synchrotron radiation by means of (grazing incidence) X-ray diffraction and soft/hard X-ray photoelectron spectroscopy, respectively.
The measurements revealed interdiffusion of CoO and Fe3O4 films after an annealing temperature of 673K and probable formation of CoxFe3−xO4.