Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Poster Wednesday: Surface Structure, Epitaxy and Growth
O 65.10: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B1
From Fe3O4/NiO bilayers to NiFe2O4-like thin films through Ni interdiffusion — •Olga Kuschel1, Ralph Buss1, Timo Kuschel2, Karsten Kuepper1, and Joachim Wollschläger1 — 1Osnabrück University, Germany — 2Bielefeld University, Germany
Ferrites with (inverse) spinel structure display a large variety of electronic and magnetic properties, making some of them interesting for potential applications in spintronics.
Especially, NiFe2O4 thin films are of huge interest since they are magnetic insulators or semiconductors with spin dependent band gap.
Therefore, they can be used as spin filters or for thermal induction of spin currents via the spin Seebeck effect.
Furthermore, electrical charge transport and spin currents can be manipulated by the spin Hall magnetoresistance using NiFe2O4 thin films adjacent to nonmagnetic spin-Hall material.
For this purpose, thermally induced formation of nickel ferrite starting with a distinct Fe3O4/NiO bilayer grown on Nb-doped SrTiO3(001) was investigated.
After synthesis a systematic three-step annealing cycle was performed. After each annealing step surface crystallographic and ’bulk’ electronic structure changes were investigated by means of low energy electron diffraction (LEED), soft and hard x-ray photoelectron spectroscopy (HAXPES).
Furthermore, structural analysis before and after the overall annealing cycle were carried out employing x-ray reflectivity (XRR) and synchrotron-radiation-based x-ray diffraction (SRXRD), as well as element- and site-specific x-ray magnetic circular dichroism (XMCD) to analyze the resulting magnetic properties.
[1] O. Kuschel et al., Phys. Rev. B 94, 094423, (2016)