Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Skyrmions II (joint session MA/TT)
MA 34.3: Talk
Wednesday, March 18, 2020, 10:15–10:30, POT 6
Manipulation of magnetization and spin textures via femtosecond laser — •Nina Novakovic1,2, Mohamad-Assaad Mawass1, Oleksii Volkov3, Wolfgang-Dietrich Engel4, Denys Makarov3, and Florian Kronast1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, 12489, Berlin, Germany — 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, 14476, Potsdam, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf e. V., Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany — 4Max Born Institute Berlin, Max-Born-Str. 2A, 12489 Berlin, Germany
Ultrafast optical control of magnetization recently became a rising field of study in magnetic thin film research, as micrometer sized domains manipulated at a small timescale may lead to faster and denser memory devices. We investigate different magnetic textures, such as bubbles and skyrmions under the influence of femtosecond laser pulses by means of photoelectron emission microscopy.
We present helicity dependent transition between stripe and bubble domains in CoPt multilayers. Moreover, manipulation of individual bubbles by tuning down laser fluence and external field is demonstrated. With the introduction of Ta layer at the interface in the CoPt system, we increase the influence of DMI. This allows us to study the formation and annihilation of skyrmions via fs laser and discuss important parameters which are required to attain reliable and efficient helicity dependent switching process, such as magnetic field and laser fluence and polarization.