Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 26: Spin dynamics and transport
MA 26.9: Vortrag
Mittwoch, 3. April 2019, 11:45–12:00, H37
Spin-orbit torque in the surface of the topological insulator Bi 2 Te 3 doped with magnetic defects — •Adamantia Kosma1, Philipp Rüssmann2, Stefan Blügel2, and Phivos Mavropoulos1 — 1Department of Physics, National and Kapodistrian University of Athens, Panepistimioupolis 15784 Athens, Greece — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
We present an ab initio investigation of the spin-orbit torque [1,2], exerted on the moments of transition metal impurities at the surface of the topological insulator Bi 2 Te 3 . We employ the multiple scattering approach as implemented in the full-potential relativistic Korringa-Kohn-Rostoker (KKR) Green function method, combined with the Boltzmann transport equation [3]. We analyze the spin accumulation and the spin flux contribution to the spin-orbit torque on the magnetic defects in response to the electric field, and we discuss the correlation of the spin-orbit torque to the spin current on the Fermi surface. We interpret the results based on the localization and the spin-polarization of the surface states. In addition, we investigate the effect of the concentration of impurities on these quantities by considering multiple random distributions of defects. This work was supported by computational time granted from the Greek Research Technology Network (GRNET) in the National HPC facility–ARIS–under project ID pr00504-TopMag. [1] A. Manchon and S. Zhang, Phys. Rev. B 79, 094422 (2009). [2] F. Freimuth et al., Phys. Rev. B 92, 064415 (2015). [3] G. G é ranton et al., Phys. Rev. B 93, 224420 (2016).