Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Spin-Torque Phenomena
MA 30.2: Talk
Wednesday, March 9, 2016, 10:15–10:30, H33
Spin-orbit effects in Pt/Co/AlOx as a function of temperature with varying ferromagnetic layer thickness — •Gurucharan V. Karnad1, Roberto Lo Conte1,2, K. Lee1, S. Prenzel1, T. Schulz1, N.-H. Kim3, K. Litzius1,2, J.-S Kim4, D.-S. Han4, H.J.M. Swagten4, C.-Y. You3, and M. Kläui1,2 — 1Johannes Gutenberg Universität-Mainz, Institut für Physik, Staudinger Weg 7, 55128 Mainz, Deutschland — 2Graduate School of Excellence Materials Science in Mainz (MAINZ), Staudinger Weg 9, 55128 Mainz, Deutschland — 3Department of Physics, Inha University, Incheon 402-751, South Korea — 4Department of Applied Physics, Center for NanoMaterials, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands
Material systems possessing perpendicular magnetic anisotropy and structural inversion asymmetry have attracted much attention due to the highly efficient current induced magnetization switching and fast domain wall motion observed in these systems. This has been attributed to spin orbit effects arising at the interface and in the bulk. Here, we report measurements of current induced domain wall motion and spin-orbit torques in Pt/Co(t)/AlOx, with varying thickness of the Co layer. We observe that the Dzyaloshinskii-Moriya interaction (DMI) decreases with increasing Co thickness, pointing to its interfacial origin. The current induced damping-like and field-like torques are also observed to be sensitive to temperature and Co thickness. This allows us to understand the relative contribution of spin-orbit effects originating at the interface and the bulk.