Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Topological Phenomena (joint session MA/TT)

TT 8.8: Vortrag

Montag, 16. März 2020, 11:15–11:30, POT 6

Magneto-electrically controllable spin-orbit torque in topological insulator thin films — •Ali G. Moghaddam1,2, Alireza Qaiumzadeh3, Anna Dyrdal4,2, and Jamal Berakdar21Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran — 2Institut für Physik, Martin-Luther Universität Halle-Wittenberg, D-06099 Halle, Germany — 3Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway — 4Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland

We investigate the inverse spin-galvanic effect (ISGE) in topological insulator thin films and the resulting spin-orbit torque (SOT) in the hybrid structures with magnetic layers. Considering in-plane magnetizations inside the magnetic layers which can shift the Dirac dispersion of surface states in the two sides, we find anisotropic ISGE and SOT with a strong dependence on the chemical potential and the magnetization. Then the magnetization-dependence of current-induced spin densities gives rise to a nonlinear field-like SOT which can be controlled by varying the magnetization and applying external gate voltages to change the chemical potential. Also, the mathematical relations between current-induced spin densities and the conductivity of this system results in similar anisotropic features in the magneto-conductance of TI thin film.

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