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Exchange scaling of ultrafast angular momentum transfer in 4f antiferromagnets
Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin, Germany.
Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin, Germany.
Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin, Germany.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
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2022 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 21, no 5, p. 514-517Article in journal (Refereed) Published
Abstract [en]

Ultrafast manipulation of magnetism bears great potential for future information technologies. While demagnetization in ferromagnets is governed by the dissipation of angular momentum1-3, materials with multiple spin sublattices, for example antiferromagnets, can allow direct angular momentum transfer between opposing spins, promising faster functionality. In lanthanides, 4f magnetic exchange is mediated indirectly through the conduction electrons4 (the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction), and the effect of such conditions on direct spin transfer processes is largely unexplored. Here, we investigate ultrafast magnetization dynamics in 4f antiferromagnets and systematically vary the 4f occupation, thereby altering the magnitude of the RKKY coupling energy. By combining time-resolved soft X-ray diffraction with ab initio calculations, we find that the rate of direct transfer between opposing moments is directly determined by this coupling. Given the high sensitivity of RKKY to the conduction electrons, our results offer a useful approach for fine tuning the speed of magnetic devices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2022. Vol. 21, no 5, p. 514-517
National Category
Condensed Matter Physics
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URN: urn:nbn:se:oru:diva-97704DOI: 10.1038/s41563-022-01206-4ISI: 000760696700001PubMedID: 35210586Scopus ID: 2-s2.0-85125386132OAI: oai:DiVA.org:oru-97704DiVA, id: diva2:1641549
Note

Funding agencies:

Max Planck Society

Foundation CELLEX

Available from: 2022-03-02 Created: 2022-03-02 Last updated: 2022-09-12Bibliographically approved

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Thonig, DannyEriksson, Olle

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