Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster: Oxide and Insulator surfaces: Structure, Epitaxy, Growth and Adsorption
O 44.1: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Formation of cobalt ferrite on SrTiO3(001) by Interdiffusion of Fe3O4/CoO bilayers — •Jannis Thien, Jari Rodewald, Martin Hoppe, Karsten Küpper, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany
Ultrathin epitaxial cobalt ferrite (CoFe2O4) films are in the focus of both spintronics and spin caloritronics since they combine semiconducting properties with ferrimagnetic properties and high Curie temperature. Therefore, cobalt ferrite films can be used as spin filters [1] or as supports for Pt films which are used to obtain deeper insight into the Spin Seebeck effect (SSE) [2].
One approach to prepare ultrathin CoFe2O4 films is reactive solid phase epitaxy where the interdiffusion of Fe3O4/CoO bilayers is used. Therefore, Fe3O4/CoO bilayers were consecutively grown by reactive molecular beam epitaxy on SrTiO3(001). Afterwards, the samples were post-annealed at different temperatures. The effects of interdiffusion were examined after each annealing step by means of x-ray reflectivity (XRR), soft x-ray photoelectron spectroscopy (Soft XPS), hard x-ray photoelectron spectroscopy (HAXPES) and x-ray diffraction (XRD) using synchrotron radiation.
XRR, Soft-XPS as well as HAXPES revealed interdiffusion of Fe3O4 and CoO layers after an annealing temperature of 673K and probable formation of Co x Fe 3−x O 4 layers with 0.4 ≤ x ≤1 .
[1] J.-B. Moussy, J. Phys. D: Appl. Phys. 46, 143001 (2013)
[2] K. Uchida et al., Nature (London) 455, 778-781 (2008)