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DS: Fachverband Dünne Schichten
DS 11: Layer Deposition
DS 11.8: Vortrag
Mittwoch, 11. März 2026, 11:30–11:45, REC/B214
Interface induced ferromagnetism and Superconductivity in epitaxially engineered thin films — •Mostafa Marzouk1,2, Anupam Singh2, Igor Mazinchenko2, Malli Tangi2, Sergey Ostanin2, Younghyuk Kim2, Ilya Kostanovski2, Arthur Ernst2, Mathew Gilbert2, and Stuart Parkin2 — 1Current Address: Institute for Topological Insulators, University of Wuerzburg, 97074 Würzburg, Germany — 2Max-Planck institute of Microstructure Physics, 06120 Halle (Saale), Germany
Two-dimensional electron gases (2DEGs) at oxide interfaces offer several advantages that are not typically found in semiconductor-based 2DEGs. One key advantage is their high sheet carrier density, which is essential for achieving the high current densities required in power and memory applications.
In this talk, I will present the emergent phenomena at oxide interfaces we grew using state-of-the-art molecular beam epitaxy (MBE), with a primary focus on the two-dimensional electron gases formed at KTaO-based interfaces. We observe the development of ferromagnetism in the KTaO3(110)/LaTiO3 and KTaO3(111)/LaTiO3 2DEGs. Remarkably, these ferromagnetic 2DEGs retain high electron mobilities, reaching approximately 250 cm2/V.s at 2 K and 20 cm2/V.s at 300 K. The presence of ferromagnetism is confirmed through anomalous Hall effect hysteresis loops, butterfly-shaped magnetoresistance hysteresis loops (down to 1.7 K), out-of-plane magnetization hysteresis loops, and x-ray magnetic circular dichroism (XMCD) measurements at 2 K.
Keywords: Molecular Beam Epitaxy; Thin Films; Two dimensional electron gases; Unconventional Superconductivity; Interface induced phenomena