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Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys
Univ Colorado, Dept Appl Math, Boulder, CO 80309 USA;NIST, Boulder, CO 80305 USA;Chalmers Univ Technol, Dept Phys, Div Theoret Phys, S-41296 Gothenburg, Sweden.
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China.
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 1756Article in journal (Refereed) Published
Abstract [en]

Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of a universal rapid magnetic order recovery in ferrimagnets with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify magnon localisation and coalescence processes, whereby localised magnetic textures nucleate and subsequently interact and grow in accordance with a power law formalism. A hydrodynamic representation of the numerical simulations indicates that the appearance of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of 107 A cm-2. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. The magnon processes discussed here provide new insights for the stabilization of desired meta-stable states.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 1756
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-382848DOI: 10.1038/s41467-019-09577-0ISI: 000464494100025PubMedID: 30988403OAI: oai:DiVA.org:uu-382848DiVA, id: diva2:1317666
Funder
EU, European Research Council, 339813EU, Horizon 2020, 737093Swedish Research Council, 637-2014-6863Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved

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