dc.contributor.author
Nádvorník, Lukáš
dc.contributor.author
Gueckstock, Oliver
dc.contributor.author
Braun, Lukas
dc.contributor.author
Niu, Chengwang
dc.contributor.author
Gräfe, Joachim
dc.contributor.author
Richter, Gunther
dc.contributor.author
Schütz, Gisela
dc.contributor.author
Takagi, Hidenori
dc.contributor.author
Seifert, Tom S.
dc.contributor.author
Kampfrath, Tobias
dc.date.accessioned
2023-01-26T13:59:00Z
dc.date.available
2023-01-26T13:59:00Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/37779
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-37492
dc.description.abstract
Transition-metal dichalcogenides (TMDCs) are an aspiring class of materials with unique electronic and optical properties and potential applications in spin-based electronics. Here, terahertz emission spectroscopy is used to study spin-to-charge current conversion (S2C) in the TMDC NbSe2 in ultra-high-vacuum-grown F|NbSe2 thin-film stacks, where F is a layer of ferromagnetic Fe or Ni. Ultrafast laser excitation triggers an ultrafast spin current that is converted into an in-plane charge current and, thus, a measurable THz electromagnetic pulse. The THz signal amplitude as a function of the NbSe2 thickness shows that the measured signals are fully consistent with an ultrafast optically driven injection of an in-plane-polarized spin current into NbSe2. Modeling of the spin-current dynamics reveals that a sizable fraction of the total S2C originates from the bulk of NbSe2 with the opposite, negative sign of the spin Hall angle as compared to Pt. By a quantitative comparison of the emitted THz radiation from F|NbSe2 to F|Pt reference samples and the results of ab initio calculations, it is estimated that the spin Hall angle of NbSe2 for an in-plane polarized spin current lies between -0.2% and -1.1%, while the THz spin-current relaxation length is of the order of a few nanometers.
en
dc.format.extent
10 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
spin Hall angles
en
dc.subject
spin-to-charge-current conversion
en
dc.subject
terahertz emission spectroscopy
en
dc.subject
transition-metal dichalcogenides (TMDCs)
en
dc.subject
ultrafast spin current injections
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
dc.title
Terahertz Spin-to-Charge Current Conversion in Stacks of Ferromagnets and the Transition-Metal Dichalcogenide NbSe2
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
2201675
dcterms.bibliographicCitation.doi
10.1002/admi.202201675
dcterms.bibliographicCitation.journaltitle
Advanced Materials Interfaces
dcterms.bibliographicCitation.number
36
dcterms.bibliographicCitation.volume
9
dcterms.bibliographicCitation.url
https://doi.org/10.1002/admi.202201675
refubium.affiliation
Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2196-7350
refubium.resourceType.provider
WoS-Alert