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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.31: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Interfacial spin-orbit effect in Ta/CoFeB/MgO — •Gurucharan V. Karnad¹, Roberto Lo Conte^1,2, Eduardo Martinez³, Ales Hrabec⁴, Andrei P. Mihai⁴, Tomek Schulz¹, Christopher H. Marrows⁴, Thomas A. Moore⁴, and Mathias 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 — ³Universidad de Salamanca, Plaza de los Caidos s/n E-37008, Salamanca, Spain — ⁴School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K.

Spin-orbit effects in out-of-plane magnetized materials have been an area of intense research due to efficient current induced domain wall motion (CIDWM) and current induced magnetization switching (CIMS) observed in these systems. Here we report the measurements of spin-orbit torques and Dzyaloshinskii-Moriya interaction (DMI) in heavy metal(HM)/ ferrmomagnet(FM)/oxide(Ox)systems.We found the DW velocity to be strongly affected by the presence of a longitudinal magnetic field, resulting in a different velocity for the up-down and down-up domain walls at fixed current densities and magnetic fields. These results can be interpreted by the spin-Hall effect-torque model [1,2], where the chirality of the domain walls is fixed by the DMI at the HM/FM interface.

[1]S. Emori,et al., Nat. Mat.12, 611-616 (2013).

[2]K.-S. Ryu,et al., Nat. Nanotech.8, 527-533 (2013).