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Authors: Seifert, Tom S.
Jaiswal, Samridh
Barker, Joseph
Weber, Sebastian T.
Razdolski, Ilya
Cramer, Joel
Gueckstock, Oliver
Maehrlein, Sebastian F.
Nadvornik, Lukas
Watanabe, Shun
Ciccarelli, Chiara
Melnikov, Alexey
Jakob, Gerhard
Münzenberg, Markus
Goennenwein, Sebastian T. B.
Woltersdorf, Georg
Rethfeld, Baerbel
Brouwer, Piet W.
Wolf, Martin
Kläui, Mathias
Kampfrath, Tobias
Title: Femtosecond formation dynamics of the spin Seebeck effect revealed by terahertz spectroscopy
Online publication date: 26-Aug-2019
Language: english
Abstract: Understanding the transfer of spin angular momentum is essential in modern magnetism research. A model case is the generation of magnons in magnetic insulators by heating an adjacent metal film. Here, we reveal the initial steps of this spin Seebeck effect with <27 fs time resolution using terahertz spectroscopy on bilayers of ferrimagnetic yttrium iron garnet and platinum. Upon exciting the metal with an infrared laser pulse, a spin Seebeck current js arises on the same ~100 fs time scale on which the metal electrons thermalize. This observation highlights that efficient spin transfer critically relies on carrier multiplication and is driven by conduction electrons scattering off the metal–insulator interface. Analytical modeling shows that the electrons’ dynamics are almost instantaneously imprinted onto js because their spins have a correlation time of only ~4 fs and deflect the ferrimagnetic moments without inertia. Applications in material characterization, interface probing, spin-noise spectroscopy and terahertz spin pumping emerge.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
URN: urn:nbn:de:hebis:77-publ-592168
Version: Accepted version
Publication type: Zeitschriftenaufsatz
License: in Copyright
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Journal: Nature communications
Pages or article number: Art. 2899
Publisher: Nature Publishing Group UK
Publisher place: London
Issue date: 2018
ISSN: 2041-1723
Publisher URL:
Publisher DOI: 10.1038/s41467-018-05135-2
Appears in collections:JGU-Publikationen

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