Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.48: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Dynamic imaging of the delay- and tilt-free motion of Néel domain walls with 200 ps time resolution — Simone Finizio1, Sebastian Wintz1,2, Katharina Zeissler3, Alexandr Sadovnikov4,5, Sina Mayr1,6, Sergej Nikitov4,5, Christopher Marrows3, and •Jörg Raabe1 — 1Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 2Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 3University of Leeds, Leeds LS2 9JT, UK — 4Saratov State University, 410012 Saratov, Russia — 5Russian Academy of Sciences, 125009 Moskow, Russia — 6ETH Zürich, 8093 Zürich, Switzerland
In this contribution, we present a time-resolved scanning-transmission x-ray microscopy investigation of the current- and magnetic field-induced domain wall motion of Néel-type domain walls in perpendicularly magnetized microwires fabricated out of Pt/CoB/Ir multilayer superlattice stacks exhibiting anti-symmetric exchange interaction. A time step of 200 ps, combined with a spatial resolution of 25 nm, was employed for the time-resolved imaging experiments, providing a first direct imaging of the dynamics of the domain wall motion with sub-ns temporal resolution. For both the current- and magnetic field-induced processes, the domain wall motion occurs synchronously with the excitation, indicating that an inertia-free motion of the domain wall. Furthermore, it was observed that, in the case of short current and magnetic field excitations, the domain wall remains perpendicular to the wire axis, providing a potential mechanism for a fast, tilt-free motion of magnetic domain walls in perpendicularly magnetized systems.