dc.contributor.author
Dewhurst, J. K.
dc.contributor.author
Shallcross, S.
dc.contributor.author
Radu, Ionela
dc.contributor.author
Elliott, P.
dc.contributor.author
v. Korff Schmising, C.
dc.contributor.author
Sharma, S.
dc.date.accessioned
2022-04-07T13:20:42Z
dc.date.available
2022-04-07T13:20:42Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/34626
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-34344
dc.description.abstract
Using an ultrashort laser pulse, we explore ab initio the spin dynamics of Gdx(FeCo)1−𝑥 at femtosecond time scales. Optical excitations are found to drive charges from Fe majority d-states to unoccupied Gd f-minority states with f-electron character excited occupation lagging behind that of the d-electron character, leading to substantial demagnetization of both species while leaving the global moment almost unchanged. For x > 0.33, this results in the creation of an ultrafast ferromagnetic (FM) transient by the end of the laser pulse with the Gd demagnetization rate slower than that of Fe. For all concentrations, the Gd moments begin to rotate from their ground state orientations developing in-plane moments of between 0.2 and 0.5 μB. Thus, the ultrafast spin dynamics of the material captures three important ingredients of all optical switching that occurs at much later (picosecond) times: (i) the development of a FM transient, (ii) the different rates of demagnetization of Fe and Gd, and (iii) the breaking of the collinear symmetry of the ground state. Furthermore, several predictions are made about the behavior of Fe–Gd alloys that can be experimentally tested and can lead to a spin-filtering device.
en
dc.format.extent
6 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
spin dynamics
en
dc.subject
Fe–Gd alloys
en
dc.subject
ab initio study
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
dc.title
Ab initio study of ultrafast spin dynamics in Gdx(FeCo)1−x alloys
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
042401
dcterms.bibliographicCitation.doi
10.1063/5.0075057
dcterms.bibliographicCitation.journaltitle
Applied Physics Letters
dcterms.bibliographicCitation.number
4
dcterms.bibliographicCitation.volume
120
dcterms.bibliographicCitation.url
https://doi.org/10.1063/5.0075057
refubium.affiliation
Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1077-3118
refubium.resourceType.provider
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