Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.28: Poster
Donnerstag, 8. September 2022, 16:00–18:00, P4
Optical manipulation of the antiferromagnetic order in a Pt/NiO bilayer system by ultrafast energy transfer — •Paul Herrgen1, Stephan Wust1, Christopher Seibel1, Hendrik Meer2, Christin Schmitt2, Lorenzo Baldrati2, Rafael Ramos3, Takashi Kikkawa4, Eiji Saitoh4, Olena Gomonay2, Jairo Sinova2, Yuriy Mokrousov2, Hans Christian Schneider1, Mathias Kläui2, Baerbel Rethfeld1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany — 3CIQUS, Departamento de Química-Física, Universidade de Santiago de Compostela, Santiago de Compostela, Spain — 4Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
Antiferromagnets are promising materials for future spintronic devices due to their resilience against external magnetic fields and their high frequency magnon modes. Here, we explore the subpicosecond magnetization dynamics of the antiferromagnet NiO after strong optical excitation with fs light pulses. We find a clear reduction of the magnetic order for a Pt/NiO bilayer systems on sub-picosecond timescales. Our observations are discussed in the framework of an extended µ T model. We conclude that the ultrafast loss of antiferromagnetic order in the Pt/NiO bilayer system is mediated by a highly efficient energy transfer between the hot Pt electrons and the NiO spins.