Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
TT 8.7: Vortrag
Montag, 16. März 2020, 11:00–11:15, POT 6
Spin orbit torque with topological insulator and ferro/anti-ferromagnetic heterostructures — •sumit ghosh1,2 and aurelien manchon2 — 1PGI-1 and IAS-1, Forschungszentrum, Jülich 52425, Germany — 2PSE, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
Due to the robust spin-orbit coupling emerging at the surfaces, topological insulators like Bi2Se3 have become a strong source of spin-orbit torque [1,2]. However in the vicinity of a magnetic element the topological protection and hence the interfacial spin-orbit coupling change drastically. In this presentation, we are going to see some of the interesting phenomena arising at the interface of a topological insulator and ferro/antiferromagnet heterostructure [3,4]. Using a simplified tight binding model we are going to show how the interfacial spin texture is modified in the presence of a magnetic element and its impact on the non-equilibrium spin density within the linear response framework. We show how the non-equilibrium spin density changes while moving from surface dominated regime to bulk dominated regime. We also explain the origin of the large spin-Hall angle for the topological insulator ferromagnet heterostructure. Finally, we show their robustness against the scalar impurity to demonstrate their superiority against their heavy metal counterpart.
 A. R. Mellnik et. al., Nature, 511, 449 (2014).
 D. C. Mahendra et. al. Nature Materials, 17, 800 (2018).
 S. Ghosh and A. Manchon, Phys. Rev. B 97, 134402 (2018).
 S. Ghosh and A. Manchon, Phys. Rev. B 100, 014412, (2019).