Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

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 manchon21PGI-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.

[1] A. R. Mellnik et. al., Nature, 511, 449 (2014).

[2] D. C. Mahendra et. al. Nature Materials, 17, 800 (2018).

[3] S. Ghosh and A. Manchon, Phys. Rev. B 97, 134402 (2018).

[4] S. Ghosh and A. Manchon, Phys. Rev. B 100, 014412, (2019).

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