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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Ultrafast Magnetization Effects II

MA 9.1: Hauptvortrag

Montag, 18. März 2024, 15:00–15:30, H 2013

Optical control of 4f orbital state in rare-earth metals — •N. Thielemann-Kühn1, T. Amrhein1, W. Bronsch2, S. Jana3, N. Pontius3, R. Y. Engel4, P. S. Miedema4, D. Legut5, K. Carva6, U. Atxitia1, B. E. van Kuiken7, M. Teichmann7, R. E. Carley7, L. Mercadier7, A. Yaroslavtsev7, G. Mercurio7, L. Le Guyader7, N. Agarwal7, R. Gort7, A. Scherz7, S. Dziarzhytski4, G. Brenner4, F. Pressacco4, R.-P. Wang4,10, J. O. Schunck4,10, M. Sinha4, M. Beye4, G. S. Chiuzbăian9, P.. Oppeneer8, M. Weinelt1, and C. Schüßler-Langeheine31Freie Universität Berlin — 2Elettra-Sincrotrone Trieste — 3Helmholtz-Zentrum Berlin — 4Deutsches Elektronen-Synchrotron — 5IT4Innovations & Nanotechnology Centre — 6Charles University — 7European XFEL — 8Uppsala University — 9Sorbonne Université — 10Universität Hamburg

Rare-earth 4f metals play a key role in materials which allow all-optical switching and their large spin-orbit coupling can result in strong magneto-crystalline anisotropy (MCA) - a property highly relevant for stable magnetic information storage. In time-resolved X-ray absorption (XAS) and Resonant inelastic X-ray scattering (RIXS) studies on different 4f-metals, we found that 5d-4f inelastic electron-electron scattering leads to selective excitation in the 4f shell, which change the angular momentum J. As a consequence, the MCA and thus coupling of the 4f-spin system to its environment is manipulated on fs-timescales. In the case of Dy we observed ferro- and antiferromagnetic dynamics to be strongly affected by the altered electronic state.

Keywords: 4f Rare-earth metals; ultrafast; X-ray Absorption XAS; Resonant Inelastic X-ray Scattering RIXS; inelastic 5d-4f electronic scattering

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