SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.8: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Skyrmion movement in Ta/CoFeB/MgO-trilayers — •Hauke Lars Heyen1, Jakob Walowski1, Christian Denker1, Malte Römer-Stumm2, Markus Münzenberg1, and Jeffrey McCord2 — 1Institut für Physik, Universität Greifswald, Felix-Hausdorff-Straße 6, 17489 Greifswald, Germany — 2Christian-Albrechts-Universität zu Kiel, Institute for Materials Science, Nanoscale Magnetic Materials and Magnetic Domains, 24143 Kiel, Germany
Skyrmion manipulation and dynamics control are promising tools for the realization of racetrack memory devices to increase data storage densities.
We use current pulses to experimentally investigate skyrmion dynamics in Ta/CoFeB/MgO-trilayers. Layer thickness control in CoFeB layers in the picometer range generated by very small thickness gradients allows to produce layers exhibiting a transition region from in-plane to out-of-plane magnetic anisotropy along the sample. This enables fine adjustment for optimal skyrmion nucleation. Skyrmions are created in the demagnetized CoFeB layer using magnetic field pulses tilted slightly out of the plane direction. Afterwards stabilized by a small out-of-plane field, skyrmion dynamics are generated with microsecond current pulses and recorded by Kerr-microscopy.
By using a specially developed tracking software to follow the motion after each current pulse, we analyze the skyrmion dynamics. The movement shows a Skyrmion-Hall-effect and a superdiffusive distribution. Further the skyrmions seem to get stuck, generated or annihilated at pinning centers.