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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 7: Focus Session: Defects and Interfaces in Multiferroics 2

KFM 7.2: Vortrag

Montag, 5. September 2022, 15:30–15:50, H5

3D imaging of multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices by atom probe tomography — •Kasper Hunnestad¹, Hena Das², Constantinos Hatzoglou¹, Megan Holtz³, Charles Brooks³, Antonius T. J. Helvoort¹, Darrell Schlom^3,4, Julia Mundy⁵, and Dennis Meier¹ — ¹Norwegian University of Science and Technology, Norway — ²Tokyo Institute of Technology, Japan — ³Cornell University, USA — ⁴Kavli Institute at Cornell for Nanoscale Science, USA — ⁵Harvard University, USA

Oxide interfaces are a rich source for novel physical phenomena, ranging from interfacial superconductivity to unusual (multi-)ferroic effects. Over the last decade, significant progress has been made in both the understanding and engineering of oxide interfaces, propelled by the ongoing progress in the development of atomic-scale characterization techniques.

Here, we introduce atom probe tomography (APT) as versatile tool for studying oxide interfaces, investigating the 3D atomic-scale structure and chemical composition of multiferroic (LuFeO3)9/(LuFe2O4)1 superlattices. Our APT measurements reveal a substantial accumulation of oxygen vacancies at the LuFe2O4 layers. Based on the data, we quantify the vacancy concentration and discuss their accumulation in relation to calculated defect formation energies and the multiferroic domain structure. In general, this research establishes a new pathway for studying the interaction of interfaces and point defects in oxides, expanding related atomic-scale investigations into 3D.