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DTSTART;TZID=Europe/Berlin:20260511T140000
DTEND;TZID=Europe/Berlin:20260511T150000
DTSTAMP:20260609T024103
CREATED:20260505T133032Z
LAST-MODIFIED:20260505T133244Z
UID:6702-1778508000-1778511600@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Texture-dependent all-optical magnetization switching in thin ferromagnetic films Dinar Khusyainov
DESCRIPTION:Texture-dependent all-optical magnetization switching in thin ferromagnetic films \n\n\n\n \n\n\n\nDinar Khusyainov \n\n\n\n \n\n\n\n\n\n\n\nRadboud University Nijmegen\, Netherland \n\n\n\n\n\n\n\n \n\n\n\nUnderstanding spin dynamics at ever shorter time and length scales is one of the major challenges in fundamental and applied magnetism. This pursuit has led\, in particular\, to the discoveries of Giant Magnetoresistance (GMR) and all-optical switching (AOS) of magnetization\, while also motivating the development of large-scale facilities such as X-ray free-electron lasers.In this talk\, I will present a conceptually novel approach for exploring all-optical switching at the nanoscale by combining tabletop Magnetic Force Microscopy (MFM) with picosecond laser excitation. The potential of this approach is demonstrated through its application to helicity-dependent all-optical switching (HD-AOS) in ferromagnetic Pt/Co/Pt films [1]. I will show how the nanotexture of laser-induced domains modifies the energy landscape\, thereby enhancing the interaction between circularly polarized light and spins. As an outlook\, I will present recent results from Lorentz transmission electron microscopy studies of laser-induced domains in thin ferromagnetic films\, highlighting their topology. \n\n\n\n[1] D. Khusyainov et al.\, Nat. Mater. (2026). \n\n\n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-texture-dependent-all-optical-magnetization-switching-in-thin-ferromagnetic-films-dinar-khusyainov/
LOCATION:University of Augsburg\, Room 242-R
CATEGORIES:Sonderseminar
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DTSTART;TZID=Europe/Berlin:20260520T141500
DTEND;TZID=Europe/Berlin:20260520T151500
DTSTAMP:20260609T024103
CREATED:20260517T180517Z
LAST-MODIFIED:20260517T180519Z
UID:6732-1779286500-1779290100@www.trr360.de
SUMMARY:TRR 360 Seminar:Topology in multi-level systems and braiding of band singularities F. Nur Ünal
DESCRIPTION:Topology in multi-level systems and braiding of band singularities \nDr. F. Nur Ünal \nTCM Group\, Cavendish Laboratory\, University of Cambridge\, United Kingdom \n\n\n\n\n\n\nRecent years have witnessed the discovery of novel multi-gap topologies that go beyond all previously-known classifications\, arising from intricate non-Abelian braiding procedures. I will talk about non-Abelian charges that can be associated with band singularities in certain multi-level systems and discuss their braiding procedures. I will introduce new non-Abelian topological phases\, some of which come with no static counterparts\, highlighting new topological invariants required to characterise these phases. The underlying non-Abelian charges can be however quite elusive\, and consequently direct measurement of these charges and topological invariants has been challenging. To this end\, I will identify observable signatures within reach of state-of-the-art experiments and present concrete protocols with first experimental verifications. Finally\, I will go beyond these non-Abelian topological considerations and introduce visually powerful geometric descriptions that arise for multi-level systems (qudits) with more general applications. \n\n\n\narXiv:2511.03894 \n\n\n\narXiv:2603.04489 \n\n\n\nNat. Comm. 15\, 1144 (2024) \n\n\n\nPhys. Rev. Lett. 133\, 093404 (2024) \n\n\n\nPhys. Rev. Research 4\, 023120 (2022) \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartopology-in-multi-level-systems-and-braiding-of-band-singularities-f-nur-unal/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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