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O: Fachverband Oberflächenphysik
O 64: Surface Magnetism
O 64.4: Vortrag
Mittwoch, 11. März 2026, 16:00–16:15, HSZ/0403
Light-driven modulation of proximity-enhanced functionalities in hybrid nano-scale systems — •Mattia Benini1,2, Umut Parlak3, Jaka Strohsack4, Andrea Droghetti5, Tomaz Mertelj4, Valentin Alek Dediu2, and Mirko Cinchetti1 — 1Department of Physics, TU-Dortmund, Dortmund, Germany — 2ISMN-CNR, Bologna, Italy — 3Department of Physics, Univesity of Konstanz, Konstanz, Germany — 4Jozef Stefan Institute, Ljubljana, Slovenia — 5Universitá Ca’ Foscari, Venezia, Italy
Recent research on Co thin films surface-hybridized with π-conjugated organic molecules demonstrated that interfacial p-d hybridization[1] leads to the establishment of an exotic magnetic configuration, called Correlated Ferromagnetic Glass (CFG). It features a glassy-like arrangement of the magnetization and vortex topological defects[2], a strongly enhanced coercivity, and an unexpected complex magnetization dynamics[3]. In this work, we demonstrate that the interface-driven magnetic properties can be actively controlled by optical means, using Co/C60 heterostructures as a prototypical system. By generating excitons in the molecular layer with resonant ultrashort light pulses, we achieve up to a 60% reduction of the magnetization precession frequency, ultimately due to a quenching of the interface-induced magnetic anisotropy[4]. References [1] Cinchetti, M. et al., Nat. Mater. 2017, 16 (5), 507*515. [2] Benini, M. et al., Nat Commun 2025, 16 (1), 5807. [3] Strohsack, J. et al., Science Advances 2025, 11 (31), eadw2243. [4] Benini, M. et al., Nat Commun 2025, 16 (1), 7297.
Keywords: ultrafast magnetization dynamics; interface magnetic anisotropy; ferromagnet/molecule heterostructures