Determination of sub-ps lattice dynamics in FeRh thin films.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
20 May 2022
20 May 2022
Historique:
received:
16
03
2022
accepted:
12
05
2022
entrez:
20
5
2022
pubmed:
21
5
2022
medline:
21
5
2022
Statut:
epublish
Résumé
Understanding the ultrashort time scale structural dynamics of the FeRh metamagnetic phase transition is a key element in developing a complete explanation of the mechanism driving the evolution from an antiferromagnetic to ferromagnetic state. Using an X-ray free electron laser we determine, with sub-ps time resolution, the time evolution of the (-101) lattice diffraction peak following excitation using a 35 fs laser pulse. The dynamics at higher laser fluence indicates the existence of a transient lattice state distinct from the high temperature ferromagnetic phase. By extracting the lattice temperature and comparing it with values obtained in a quasi-static diffraction measurement, we estimate the electron-phonon coupling in FeRh thin films as a function of laser excitation fluence. A model is presented which demonstrates that the transient state is paramagnetic and can be reached by a subset of the phonon bands. A complete description of the FeRh structural dynamics requires consideration of coupling strength variation across the phonon frequencies.
Identifiants
pubmed: 35595862
doi: 10.1038/s41598-022-12602-w
pii: 10.1038/s41598-022-12602-w
pmc: PMC9122986
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
8584Subventions
Organisme : National Centers of Competence in Research in Molecular Ultrafast Science and Technology
ID : 51NF40-183615
Organisme : H2020 Marie Skłodowska-Curie Actions
ID : 801459 - FP-RESOMUS
Informations de copyright
© 2022. The Author(s).
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