Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 93: Surface Magnetism (joint session MA/O)
O 93.8: 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.