Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 44: Surface Magnetism (joint session MA/O)

MA 44.8: Talk

Thursday, March 19, 2020, 11:45–12:00, HSZ 101

Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr₂Si₂ — •Susanne Schulz¹, Ilya A. Nechaev², Monika Güttler¹, Georg Poelchen¹, Steffen Danzenbächer¹, Silvia Seiro³, Kristin Kliemt⁴, Evgueni V. Chulkov⁵, Clemens Laubschat¹, Eugene E. Krasovskii⁵, Christoph Geibel⁶, Cornelius Krellner⁴, Kurt Kummer⁷, and Denis V. Vyalikh⁵ — ¹Institut für Festkörper- und Materialphysik, TU Dresden, Germany — ²Centro de Física de Materiales CFM-MPC and Centro Mixto CSIC-UPV/EHU, Donostia/San Sebastián, Spain — ³IFW Dresden, Germany — ⁴Kristall- und Materiallabor, Goethe-Universität Frankfurt, Germany — ⁵Donostia International Physics Center, Donostia/San Sebastián, Spain — ⁶MPI für Chemische Physik fester Stoffe, Dresden, Germany — ⁷European Synchrotron Radiation Facility, Grenoble, France

Here, we present the valence-fluctuating material EuIr₂Si₂, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent intermediate valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface.