Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 43: Spintronics (joint session HL/TT)

HL 43.9: Talk

Thursday, March 15, 2018, 17:15–17:30, EW 201

Spin-transfer torques generated by strained 3D HgTe TI — •Graciely Santos, Simon Hartinger, Christian Jünger, Erwann Bocquillon, Charles Gould, and Laurens Molenkamp — Julius-Maximilians-Universität Würzburg, Würzburg - Germany

Strained bulk HgTe is a well known topological insulator (3D TI) showing the coexistence of an insulating bulk with metallic Dirac surface states presenting intrinsic spin-momentum locking. By applying an electric current through the surface states of a 3D TI, a spin-polarized current can be generated allowing transfer of angular momentum to an adjacent ferromagnetic layer. Preliminary spin-pumping ferromagnetic resonance (FMR) measurements on the HgTe 3D TI coupled to a ferromagnet island showed a background contribution in the measured voltages. In this work we report on spin-transfer torque ferromagnetic resonance (STT-FMR) measurements in order to better understand the previous results in this system.