Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Magnetic Heuslers, half-metals and oxides

MA 53.9: Vortrag

Freitag, 5. April 2019, 11:45–12:00, H33

Tunable magnetic phases at Fe₃O₄/SrTiO₃ oxide interfaces — •Mai Hussein Hamed¹, Ronja Anika Hinz¹, Marek Wilhelm¹, Andrei Gloskovskii², Peter Bencok³, Claus M. Schneider^1,4, and Martina Müller^1,5 — ¹Peter-Grünberg-Institut (PGI-6), Forschungszentrum Julich GmbH, Germany — ²Photon Science, DESY, Hamburg, Germany — ³Diamond Light Source, Didcot, UK — ⁴Fakultät für Physik, Duisburg-Essen Universität , Germany — ⁵Experimentelle Physik I, Technische Universität Dortmund, Germany

Oxide heterointerfaces can reveal exciting physical phenomena and pave the ground for novel applications. The prospect of designing and controlling the magnetic properties at the atomic scale of oxide heterointerfaces is one of the major challenges, as this would pave the route towards spintronic applications with novel quantum phases. In this context, merging transition-metal oxides into heterostructures is very promising, owing to their many remarkable properties, such as emerging conductivities, magnetism or ferroelectricity. My research demonstrates the emergence and control of magnetic phases between magnetite (Fe₃O₄), a half-metallic ferrimagnetic, and SrTiO₃, a transparent non-magnetic insulator. Using the bulk and interface elemental X-ray techniques, the depth-dependent electronic and magnetic properties of the films and interfaces are studied. This provides an analytical proof for the formation of a magnetically active γ−Fe₂O₃ intralayer. By taking control of the redox chemical processes at the oxide interface, the efficient reduction into a fully stoichiometric and ferrimagnetic Fe₃O₄/SrTiO₃(001) system can be realized.