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  The ultrafast Einstein–de Haas effect

Dornes, C., Acremann, Y., Savoini, M., Kubli, M., Neugebauer, M. J., Abreu, E., et al. (2019). The ultrafast Einstein–de Haas effect. Nature, 565(7738), 209-222. doi:10.1038/s41586-018-0822-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-CCD1-C Version Permalink: http://hdl.handle.net/21.11116/0000-0002-CCD2-B
Genre: Journal Article

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https://arxiv.org/abs/1804.07159 (Preprint)
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 Creators:
Dornes, C.1, Author
Acremann, Y.2, Author
Savoini, M.1, Author
Kubli, M.1, Author
Neugebauer, M. J.1, Author
Abreu, E.1, Author
Huber, L.1, Author
Lantz, G.1, Author
Vaz, C. A. F.3, Author
Lemke, H.4, Author
Bothschafter, E. M.3, Author
Porer, M.3, Author
Esposito, V.3, Author
Rettig, L.3, 5, Author
Buzzi, M.3, 6, Author              
Alberca, A.3, Author
Windsor, Y. W.3, 5, Author
Beaud, P.4, Author
Staub, U.3, Author
Zhu, D.7, Author
Song, S.7, AuthorGlownia, J. M.7, AuthorJohnson, S. L.1, 4, Author more..
Affiliations:
1Institute for Quantum Electronics, Physics Department, ETH Zurich, ou_persistent22              
2Laboratory for Solid State Physics, Physics Department, ETH Zurich, ou_persistent22              
3Swiss Light Source, Paul Scherrer Institute, Villigen, ou_persistent22              
4SwissFEL, Paul Scherrer Institute, Villigen, ou_persistent22              
5Fritz Haber Institute of the Max Planck Society, Berlin, ou_persistent22              
6Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
7Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, ou_persistent22              

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 Abstract: The Einstein-de Haas effect was originally observed in a landmark experiment1 demonstrating that the angular momentum associated with aligned electron spins in a ferromagnet can be converted to mechanical angular momentum by reversing the direction of magnetization using an external magnetic field. A related problem concerns the timescale of this angular momentum transfer. Experiments have established that intense photoexcitation in several metallic ferromagnets leads to a drop in magnetization on a timescale shorter than 100 femtoseconds—a phenomenon called ultrafast demagnetization2,3,4. Although the microscopic mechanism for this process has been hotly debated, the key question of where the angular momentum goes on these femtosecond timescales remains unanswered. Here we use femtosecond time-resolved X-ray diffraction to show that most of the angular momentum lost from the spin system upon laser-induced demagnetization of ferromagnetic iron is transferred to the lattice on sub-picosecond timescales, launching a transverse strain wave that propagates from the surface into the bulk. By fitting a simple model of the X-ray data to simulations and optical data, we estimate that the angular momentum transfer occurs on a timescale of 200 femtoseconds and corresponds to 80 per cent of the angular momentum that is lost from the spin system. Our results show that interaction with the lattice has an essential role in the process of ultrafast demagnetization in this system.

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Language(s): eng - English
 Dates: 2018-04-182018-10-172019-01-022019-01-10
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41586-018-0822-7
arXiv: 1804.07159
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 565 (7738) Sequence Number: - Start / End Page: 209 - 222 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238