Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 44: Spininjection / Spin currents in heterostructures

MA 44.10: Vortrag

Donnerstag, 10. März 2016, 17:30–17:45, H31

Investigation of the spin pumping effect in epitaxially grown Fe/MgO/Pt systems — •Mihalceanu L.¹, Keller S.¹, Conca A.¹, Pliatsikas N.², Karfaridis D.², Vourlias G.², Hillebrands B.¹, and Papaioannou E. Th.¹ — ¹TU Kaiserslautern, Erwin-Schrödinger-Straße 1, 67663 Kaiserslautern — ²Dep. of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, GR

Understanding and improving the generation of spin currents at the interface of thin ferromagnetic (FM)/ non magnetic (NM) and FM/ Insulator (I)/NM stacks provides a challenging opportunity for developing faster data-processing nanoelectronics devices with low energy consumption. Here we investigate the influence of an MgO tunneling barrier in Fe/MgO/Pt systems on the spin pumping effect which is based upon a spin current getting injected from the FM into the NM layer. The injected spin current is detected via the inverse spin Hall effect (ISHE). The signal is analysed by fitting a symmetric and an antisymmetric Lorenzian formula. By means of the spin pumping FMR measurements we demonstrate that an increasing thickness of the MgO interlayer leads to an increased signal of ISHE DC-voltage with a more pronounced dependence of the symmetric part over the antisymmetric one. We correlate our results with structural analysis of the trilayers. Employing X-ray diffraction we show single crystal growth of Pt on top of an MgO interlayer while Fe grows epitaxially on the MgO substrate. X-ray photoemission spectroscopy is also used to reveal the chemical synthesis of the interfaces. Financial support by the Carl Zeiss Stiftung and by the DAAD-PPP GR program are gratefully acknowledged.