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http://doi.org/10.25358/openscience-111| 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 |
| Year of first publication: | 2018 |
| 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 |
| ROR: | https://ror.org/023b0x485 |
| DOI: | http://doi.org/10.25358/openscience-111 |
| URN: | urn:nbn:de:hebis:77-publ-592168 |
| Version: | Accepted version |
| Publication type: | Zeitschriftenaufsatz |
| License: | In Copyright |
| Information on rights of use: | https://rightsstatements.org/vocab/InC/1.0/ |
| Journal: | Nature communications 9 |
| Pages or article number: | Art. 2899 |
| Publisher: | Nature Publishing Group UK |
| Publisher place: | London |
| Issue date: | 2018 |
| ISSN: | 2041-1723 |
| Publisher URL: | http://dx.doi.org/10.1038/s41467-018-05135-2 |
| Publisher DOI: | 10.1038/s41467-018-05135-2 |
| Appears in collections: | JGU-Publikationen |
