Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Ultrafast Magnetization Effects 2

MA 25.5: Vortrag

Mittwoch, 7. September 2022, 16:00–16:15, H43

Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer — •Stephan Wust¹, Christopher Seibel¹, Hendrik Meer², Paul Herrgen¹, Christin Schmitt², Lorenzo Baldrati², Rafael Ramos³, Takashi Kikkawa⁴, Eiji Saitoh⁴, Olena Gomonay², Jairo Sinova², Yuriy Mokrousov², Hans Christian Schneider¹, Mathias Kläui², Baerbel Rethfeld¹, Benjamin Stadtmüller^1,2, and Martin Aeschlimann¹ — ¹Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — ²Institute of Physics, Johannes Gutenberg-University 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 candidates for improved future spintronic devices in terms of robustness and speed. Here, we report the ultrafast, (sub)picosecond reduction of the antiferromagnetic order of the insulating NiO thin film in a Pt/NiO bilayer. This reduction of the antiferromagnetic order is not present in pure NiO thin films after a strong optical excitation. This ultrafast phenomenon is attributed to an ultrafast and highly efficient energy transfer from the optically excited electron system of the Pt layer into the NiO spin system. We propose that this energy transfer is mediated by a stochastic exchange scattering of hot Pt electrons at the Pt/NiO interface.