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MA: Fachverband Magnetismus

MA 30: Spin-Torque Phenomena

MA 30.2: Vortrag

Mittwoch, 9. März 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 Conte^1,2, K. Lee¹, S. Prenzel¹, T. Schulz¹, N.-H. Kim³, K. Litzius^1,2, J.-S Kim⁴, D.-S. Han⁴, H.J.M. Swagten⁴, C.-Y. You³, and M. Kläui^1,2 — 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.