Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Spin-dependent transport phenomena
MA 54.5: Vortrag
Freitag, 16. März 2018, 09:00–09:15, EB 301
Temperature dependence of the generation and transport of pure spin currents using the spin Hall effect and spin injection — •Alexander Pfeiffer1,2, Robert M. Reeve1, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, Mainz, Germany
The spin Hall effect (SHE), observed in nonmagnetic heavy metals with large spin orbit coupling such as Platinum and Tungsten, has received remarkable recent interest as an attractive alternative to electrical spin injection for the generation of spin currents. Such spin currents can be employed to switch magnetic bits efficiently in low power data storage devices [1]. Given surprising results of the temperature dependence of spin current generation and transport in lateral spin valves [2], we study multi-terminal Py-Pt-Cu based lateral spin valve structures. We inject spin currents into the Copper via both the SHE in Platinum and spin injection from Permalloy and compare both conventional non-local signals and those generated via the inverse spin Hall effect (iSHE) in a single device as a function of temperature. We observe a different temperature behaviour in the different cases, which we explain by the different mechanisms occuring in the Platinum and Permalloy and highlighting the governing temperature dependence of the spin injection rather than the spin transport as previously expected. [1] N. Motzko et al., Phys. Rev. B 88, 214405 (2013) [2] A. Pfeiffer et al., Appl. Phys. Lett 107, 082401 (2015)