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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects 1

MA 8.6: Vortrag

Montag, 5. September 2022, 16:15–16:30, H37

Ultrafast optical generation of antiferromagnetic spin texture — •Sumit Ghosh^1,2, Stefan Blügel¹, and Yuriy Mokrousov^1,2 — ¹PGI1, Forschungszentrum Jülich, Germany. — ²Institute of Physics, Johannes Gutenberg-University Mainz, Germany.

We present here an unified picture of ultrafast manipulation of collinear antiferromagnetic order by combining both electronic and magnetic degrees of freedom via a hybrid quantum classical evolution scheme. Our approach allows us to probe slow magnetic relaxation for several picoseconds with a sub-femtosecond resolution and thus allows us to identify the emergent interactions driving the formation of nontrivial textures which remains hidden from classical magnetisation dynamics. In case of a one dimensional spin chain this mechanism can lead to the formation of spin spirals [1] where the induces chirality can be tuned with the laser parameter. In case of two dimensional antiferromagnets this mechanism can lead to more exotic outcome - generation of a texture and anti-texture which can survive for 100ps [2] and is fairly robust against impurity. Our results thus opens new possibilities to generate higher order nontrivial magnetic texture with ultrafast laser.

[1] S. Ghosh, et.al. Communications Physics, 5(1), 69, 2022. https://doi.org/10.1038/s42005-022-00840-3

[2] S. Ghosh, S. Blügel and Y. Mokrousov. arXiv:2205.12100. http://arxiv.org/abs/2205.12100