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State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-4125-3157
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Number of Authors: 202022 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 120, no 3, article id 032401Article in journal (Refereed) Published
Abstract [en]

We use transient absorption spectroscopy with circularly polarized x rays to detect laser-excited hole states below the Fermi level and compare their dynamics with that of unoccupied states above the Fermi level in ferromagnetic [Co/Pd] multilayers. While below the Fermi level, an instantaneous and significantly stronger demagnetization is observed, above the Fermi level, the demagnetization is delayed by 35 ± 10 fs. This provides a direct visualization of how ultrafast demagnetization proceeds via initial spin-flip scattering of laser-excited holes to the subsequent formation of spin waves. 

Place, publisher, year, edition, pages
2022. Vol. 120, no 3, article id 032401
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Atom and Molecular Physics and Optics
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URN: urn:nbn:se:su:diva-204380DOI: 10.1063/5.0076953ISI: 000779205300016Scopus ID: 2-s2.0-85123756570OAI: oai:DiVA.org:su-204380DiVA, id: diva2:1655974
Available from: 2022-05-04 Created: 2022-05-04 Last updated: 2022-05-04Bibliographically approved

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Pancaldi, MatteoBonetti, Stefano

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