Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.14: Poster
Monday, March 9, 2026, 09:30–12:30, P2
Femtosecond spin dynamics in Ni and Fe probed by transient x-ray magnetic circular dichroism — •L. Endler1, M. Elhanoty2, T. Lojewski3, L. Le Guyader4, G. Mercurio4, B. van Kuiken4, J. Tasto5, L. Kämmerer5, A. Delin6, O. Eriksson2, O. Granas2, U. Bovensiepen5, H. Wende5, K. Ollefs1, and A. Eschenlohr5 — 1Univ. Heidelberg — 2Uppsala Univ. — 3Univ. of Tokyo — 4European XFEL — 5Univ. Duisburg-Essen — 6KTH Sweden
Despite their simple compositions, elemental Fe, Ni and their alloys still spark questions with regard to ultrafast demagnetization dynamics after photoexcitation. By combining ultrafast X-ray absorption, circular dichroism spectroscopy (XMCD) and ab intio theory we aim to entangle the underlying processes in elemental Fe and Ni. Electronic correlations have been found to influence the dynamics at ultrafast timescales in elemental Ni [1]. We observed XMCD peak shifts toward lower photon energies at <1 ps timescales, followed by a shift towards higher energies at a few ps. Fe XMCD spectra showed an increase in L3 and decrease in L2 edge spectral area at ≈ 100 fs.
We acknowledge the financial support through the DFG within the framework of the CRC1242.
[1] T. Lojewski et al., Mater. Res. Lett., 11, 655 (2023)
Keywords: X-ray spectroscopy; Ultrafast demagentization; Ultrafast dynamics