SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.11: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Imprinting chirality in an antiferromagnetic spin chain with ultrafast laser — •Sumit Ghosh1,2, Frank Freimuth1,2, Olena Gomonay2, Stefan Blügel1, and Yuriy Mokrousov1,2 — 1PGI-1 and IAS-1, Forschungszentrum Jülich, Jülich, Germany — 2Institute of Physics, Johannes Gutenberg-University Mainz, Germany
Recent experimental generation of skyrmions with ultrafast laser pulses [1] has opened new horizons in ultrafast generation of chiral magnetic order. However, the theoretical understanding of the underlying physics is still under mist which poses a hurdle in further manipulation of laser induced chirality. We present here a complete picture of the laser induces chirality generation by combining the classical magnetisation dynamics with quantum evolution of states which reveals the pertinent features of fast electron dynamics as well as slow magnetisation dynamics leading to the formation of a chiral structure [2]. We have successfully identified the emergent electronic interactions resulting the formation of the chiral structure which can survive for nanoseconds. We demonstrate the distinction between the dynamics initiated by a thermal re-population, and the laser excited dynamics and also show how to manipulate the end states by tuning the laser parameter. Our findings are fairly robust against thermal fluctuation which makes them feasible for experimental realisation and thus open new ways to explore the intertwined optical and magnetisation dynamics.
[1] F. Büttner et al. Nat. Mater. 20, 30-37 (2021).
[2] S. Ghosh, F. Freimuth, O. Gomonay, S. Blügel, Y. Mokrousov, arXiv:2011.01670.