Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.21: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
SEMPA imaging of magnetic spin configurations and manipulation by spin currents — •Daniel Schönke1, Pascal Krautscheid1,2, Maike Lauf1, Benjamin Krüger1, Robert M. Reeve1, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany
Control of the magnetic configuration of nanoscale structures is vital for spintronic device applications. The initial magnetic state is mainly set by material parameters and geometry, while manipulation can be realized using spin-transfer and spin-orbit torques. Scanning electron microscopy with polarization analysis (SEMPA) is a powerful imaging technique to investigate these effects with high resolution and surface sensitivity. We demonstrate how specific domain wall types can be tailored in wires by choosing the dimensions [1] and via geometrical confinement at notches. For the vortex state in disks, spin currents are then employed to manipulate the vortex core, with the imaged displacement related to the non-adiabatic torque [2,3]. By rare earth Dy-doping, the damping can be changed and the resulting change of the non-adiabaticity can be probed and compared to the theory [3]. Direct imaging of spin accumulation would be a next step, however remains challenging due to the low signal and other current-induced effects [4]. [1] P. Krautscheid et al., J. Phys. D: Appl. Phys. 49, 425004 (2016). [2] L. Heyne et al., Phys. Rev. Lett. 105, 187203 (2010). [3] A. Bisig et al., Phys. Rev. Lett. (in press 2016), arxiv:1511.06585 [4] P. Riego et al., Appl. Phys. Lett. 109, 172402 (2016).