Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
15 04 2019
15 04 2019
Historique:
received:
14
09
2018
accepted:
13
03
2019
entrez:
17
4
2019
pubmed:
17
4
2019
medline:
17
4
2019
Statut:
epublish
Résumé
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 10
Identifiants
pubmed: 30988403
doi: 10.1038/s41467-019-09577-0
pii: 10.1038/s41467-019-09577-0
pmc: PMC6465265
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Pagination
1756Subventions
Organisme : Department of Energy
ID : DE-AC02-76SF00515
Pays : International
Organisme : National Science Foundation
ID : DMS-1255422
Pays : International
Organisme : Department of Energy
ID : 0000231415
Pays : International
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