Ultrafast magnon generation in an Fe film on Cu(100).
作者： A. B. Schmidt , M. Pickel , M. Donath , P. Buczek , A. Ernst
DOI: 10.1103/PHYSREVLETT.105.197401
关键词: Spin wave 、 Relaxation (NMR) 、 Electron 、 Ab initio quantum chemistry methods 、 Condensed matter physics 、 Magnon 、 Femtosecond 、 Materials science 、 Ultrashort pulse 、 Spin (physics)
摘要: We report on a combined experimental and theoretical study of the spin-dependent relaxation processes in electron system an iron film Cu(100). Spin-, time-, energy- angle-resolved two-photon photoemission shows strong characteristic dependence lifetime photoexcited electrons their spin energy. Ab initio calculations as well many-body treatment corroborate that observed properties are determined by involving magnon emission. Thereby we demonstrate emission hot occurs femtosecond time scale thus provides significant source ultrafast spin-flip processes. Furthermore, engineering spectrum paves way for tuning dynamic magnetic materials.
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