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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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1804.07159.pdf (Preprint), 3MB
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1804.07159.pdf
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arXiv:1804.07159v2 [cond-mat.str-el] 17 Jul 2018
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2018
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 Urheber:
Dornes, C.1, Autor
Acremann, Y.2, Autor
Savoini, M.1, Autor
Kubli, M.1, Autor
Neugebauer, M. J.1, Autor
Abreu, E.1, Autor
Huber, L.1, Autor
Lantz, G.1, Autor
Vaz, C. A. F.3, Autor
Lemke, H.4, Autor
Bothschafter, E. M.3, Autor
Porer, M.3, Autor
Esposito, V.3, Autor
Rettig, Laurenz3, 5, Autor           
Buzzi, M.3, 6, Autor           
Alberca, A.3, Autor
Windsor, Yaov William3, 5, Autor           
Beaud, P.4, Autor
Staub, U.3, Autor
Zhu, Diling7, Autor
Song, S.7, AutorGlownia, J. M.7, AutorJohnson, S. L.1, 4, Autor mehr..
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              
5Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
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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 Zusammenfassung: The Einstein-de Haas effect was originally observed in a landmark experiment 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 demagnetization. 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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Sprache(n): eng - English
 Datum: 2018-04-182018-10-172019-01-022019-01-10
 Publikationsstatus: Erschienen
 Seiten: 14
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/s41586-018-0822-7
arXiv: 1804.07159
 Art des Abschluß: -

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Titel: Nature
  Kurztitel : Nature
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: 14 Band / Heft: 565 (7738) Artikelnummer: - Start- / Endseite: 209 - 222 Identifikator: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238