Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.18: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
Structural insight into spin-orbit effects in metal-oxide/Co/Pt sandwiches — •Martin Kopte1, T. Kosub1, U. K. Rößler2, R. Schäfer2, A. Kákay1, F. Radu3, O. G. Schmidt2, J. Lindner1, J. Faßbender1, and D. Makarov1 — 1Helmholtz-Zentrum Dresden-Rossendorf e.V., Germany — 2Leibniz-Insitut für Festkörper- und Werkstoffforschung, Dresden, Germany — 3Helmholz-Zentrum Berlin für Materialien und Energie, Germany
Novel spinorbitronic devices require a subtle control of spin-orbit effects such as Dzyaloshinskii-Moriya interaction (DMI), spin orbit torques (SOT) and magnetoresistance effects. Here we study the impact of interface properties on the strength of these effects in out-of-plane magnetised metal-oxide/Co/Pt sandwiches. The interface-induced DMI in samples prepared with chromium oxide as the metal oxide layer is quantified by using several approaches. A detailed structural investigation of these samples as well as a comparison to the literature data of samples capped with e.g. magnesium or aluminum oxide show that the DMI strength is predominantly determined by the quality of the Pt/Co interface. Within the accuracy of the experimental data at hand we do not find evidence for a recently predicted Rashba-like contribution of the metal-oxide/Co interface to the DMI strength. Quantification of SOT by harmonic analysis of magnetoresistance data provides complementary insight into the crucial structural dependence of spin-orbit effects. Our experimental data and analysis demonstrate the impact on DMI and SOT, and the possibility to tune these effects, by microstructural details in asymmetric layer stacks.