Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Spintronics (incl. Quantum Dynamics)
(Joint session of MA, HL and TT organized by MA)

TT 45.8: Vortrag

Mittwoch, 9. März 2016, 11:30–11:45, H32

Bulk Spin-Orbit Torques at finite temperatures in Bulk Half-Metallic Heuslers from First Principle — •Jacob Gayles¹, Libor Šmejkal², Jakub Železny², Frank Freimuth³, Zhe Yuan¹, Yuriy Mokrousov³, Tomas Jungwirth², and Jairo Sinova¹ — ¹Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany — ²Institute of Physics ASCR, v.v.i., Cukrovarnicka 10, 162 53 Praha 6 Czech Republic — ³Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

We predict bulk spin-orbit torques in the half-metallic Heuslers NiMnSb and PtMnSb, using symmetry arguments in conjunction with first principle calculations. We present under uniaxial growth strain a linear dependence of the even torque and that can be tuned to zero while observing a sizable odd torque is independent of strain. Furthermore, these effects are seen to be two orders of magnitude larger in the PtMnSb. The even torque is strongly dependent on the temperature decreasing by 75% at room temperature where finite temperature is taken into account in the frozen phonon approximation. We show the equivalence of two widely used methods, the Landauer-Bütikker and the Kubo linear response formalism giving confidence in our result for experimental measurements in bulk magnetic Heusler compounds breaking inversion symmetry.