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)

Europe/Berlin
via Zoom

via Zoom

Description

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
Passcode: 689182
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Organized by

Serguei Molodtsov / Gabriella Mulá-Mathews