SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.12: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Ultrafast light-induced torques and Hall effects driven by laser pulses in thin films — •Hanan Hamamera^1,2, Filipe Souza Mendes Guimaraes³, Mnauel dos Santos Dias¹, and Samir Lounis^1,4 — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — ²Department of Physics, RWTH Aachen University, 52056 Aachen, Germany — ³Jülich Supercomputing Centre, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — ⁴Faculty of Physics, University of Duisburg-Essen and CENIDE, 47053 Duisburg, Germany

Effective control of the magnetization at ultrafast timescale using lasers have the capacity to revolutionize future technology devices. Based on realistic time-dependent electronic structure simulations [1], we have shown that the polarization of laser pulses are determinant to switch the magnetization via the inverse-Faraday like effect [1]. Even the magnetization of an elementary magnet such as bulk Ni can be reversed due to ultrafast light-induced torques. We extended this work to Co films on Pt(001), where various ultrafast Hall effects in conjunction with the inverse-Faraday effect dictate the observed complex magnetization dynamics. We discuss these phenomena in the light of the unveiled mechanisms and proceed to a systematic comparison with previous works.
— Work funded by the Palestinian-German Science Bridge (BMBF–01DH16027) and Horizon 2020–ERC (CoG 681405–DYNASORE).

[1] H. Hamamera et al., arXiv:2104.13850 (2021).