European XFEL Science Seminar

Ultrafast Magnetism – terra incognita beyond the classical approximations

by Prof. Aleksei V. Kimel (Ultrafast Spectroscopy of Correlated Materials, Radboud University, Nijmegen, The Netherlands)

via Zoom

via Zoom


While magnetism is essentially the strongest quantum mechanical phenomenon, modern description of magnetization dynamics relies on thermodynamics and the corresponding approximations. I will show that femtosecond laser pulse is a unique stimulus in magnetism that pushes the magnetization dynamics into a counter-intuitive regime, where the classical approximations fail, heat does not destroy, but reverses magnetization and solely a flash of light writes magnetic bits at the record-breaking speeds.   These and many other counter-intuitive experimental findings continuously fuel the interest to the field of ultrafast magnetism and challenge state-of-the-art theories in magnetism. In my talk I also aim to propose how XFELs can help us to develop new approximations allowing to build intuitive models in ultrafast magnetism.

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Meeting ID: 937 7979 2947
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Organized by

Serguei Molodtsov / Gabriella Mulá-Mathews