2024-03-29T07:32:46Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/442472016-02-17T07:39:08Zcom_10261_115com_10261_3col_10261_368
Ultrafast magnon generation in an Fe film on Cu(100)
Zhukov, Vladlen P.
Echenique, Pedro M.
Chulkov, Eugene V.
4 páginas, 4 figuras,-- PACS numbers: 78.47.J-, 73.20.At, 75.30.Ds, 79.60.-i.-- et al.
We report on a combined experimental and theoretical study of the spin-dependent relaxation processes in the electron system of an iron film on Cu(100). Spin-, time-, energy- and angle-resolved two-photon photoemission shows a strong characteristic dependence of the lifetime of photoexcited electrons on their spin and energy. Ab initio calculations as well as a many-body treatment corroborate that the observed properties are determined by relaxation processes involving magnon emission. Thereby we demonstrate that magnon emission by hot electrons occurs on the femtosecond time scale and thus provides a significant source of ultrafast spin-flip processes. Furthermore, engineering of the magnon spectrum paves the way for tuning the dynamic properties of magnetic materials.
Financial support by the Deutsche Forschungsgemeinschaft, UPV/EHU (Grant No. IT-366-07), and MCyT (Grant No. FIS2007-66711-C02-01) is gratefully acknowledged.
Peer reviewed
2012-01-13T13:07:08Z
2012-01-13T13:07:08Z
2010
artículo
http://purl.org/coar/resource_type/c_6501
Physical Review Letters 105(19): 197401 (2010)
0031-9007
http://hdl.handle.net/10261/44247
10.1103/PhysRevLett.105.197401
1079-7114
en
http://dx.doi.org/10.1103/PhysRevLett.105.197401
open
American Physical Society