Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 28: Topological Insulators (joint session MA/KFM)

KFM 28.6: Vortrag

Donnerstag, 8. September 2022, 16:30–16:45, H37

Investigation of the magnetic and electronic properties of topological insulator/ferromagnet heterostructures — •Simon Marotzke1,2, André Philippi-Kobs1,2, Leonard Müller1,3, Matthias Kalläne2, Jens Buck2, Wojciech Roseker1, Nils Wind3, Sanjoy Mahatha4, Nils Huse3, Gerhard Grübel1,3, Martin Beye1, and Kai Rossnagel1,21Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Christian-Albrechts-Universität zu Kiel, Germany — 3Universität Hamburg, Germany — 4Thapar Institute of Engineering and Technology, Patiala, India

Heterostructures of the design Bi2Se3/X/Co/Pt, with X = None, Pt, B4C or B4C/Pt as separation layer between the topological insulator (TI) and the ferromagnetic overlayer are studied. By means of magneto-optical Kerr effect, the magnetic behaviour is characterised, showing that perpendicular magnetic anisotropy can be achieved in the overlayer and minutely tuned by changing layer properties. In X-ray photoemission spectroscopy measurements, two Bi phases are identified in the heterostructures. By systematically varying the photon energy, the depth, in which the two Bi phases are located, is analysed. Significant differences of the chemical properties at the interface to the TI are found for heterostructures consisting of Bi2Se3 with a metallic or insulating overlayer, respectively. Finally, a scheme to invert the heterostructures is presented, potentially enabling angle-resolved photoemission spectroscopy measurements on the TI’s surface in future in order to study the influence of the magnetisation state on the TI’s surface states.

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