Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Textures: Statics and Imaging II

MA 41.7: Vortrag

Donnerstag, 4. April 2019, 11:00–11:15, H37

Observation of Skyrmion nucleation and manipulation by Ultrafast laser pulse — •Mohamad-Assaad Mawass¹, Nina Novakovic¹, Alexander Steigert¹, Oleksii Volkov², Denys Makarov², and Florian Kronast¹ — ¹Helmholtz-Zentrum Berlin für Materialen und Energie, Berlin, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden, Germany

Skyrmions are topologically protected magnetic entities, particle-like magnetization structures. They are considered as potential candidates for spintronic devices e.g. racetrack memories. While the controlled formation and motion of skyrmions is a key issue for the functionality of such devices, the conventional approach to generate and stabilize skyrmions in thin magnetic materials mostly leads to multiple and randomly distributed skyrmions (skyrmions cluster) without control on the formation or annihilation of individual entities. Here we provide a direct experimental visualization of ultrafast nucleation of individual Skyrmions by local laser heating at room temperature (RT) using a tunable fs-Laser beam in ultrathin ferromagnetic system employing X-ray Photoemission Electron Microscope (XPEEM). Furthermore, using the advantage of the all-optical helicity-dependent switching (AO-HDS) in which a circularly polarized femtosecond laser pulse switches the magnetization of a ferromagnetic thin film as function of laser helicity, we show for the first time writing and erasing one single Skyrmionic bubble domain controlled by the laser chirality at a specific laser condition at RT.