Journal
PHYSICAL REVIEW B
Volume 87, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.184425
Keywords
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Funding
- Swedish Research Council (VR)
- G. Gustafsson Foundation
- European Community [214810, 281043]
- Swedish National Infrastructure for Computing (SNIC)
- National Center CERIT Scientific Cloud (CERIT-SC) of the Czech Republic [CZ.1.05/3.2.00/08.0144]
- Nanotechnology Centre [CZ.1.07/2.3.00/20.0074]
- IT4Innovations Centre of Excellence project [CZ.1.05/1.1.00/02.0070]
- Operational Programme Education for competitiveness
- European Union
- state budget of the Czech Republic
- Czech Science Foundation [P204/11/P481]
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We report a computational theoretical investigation of electron spin-flip scattering induced by the electron-phonon interaction in the transition-metal ferromagnets bcc Fe, fcc Co, and fcc Ni. The Elliott-Yafet electron-phonon spin-flip scattering is computed from first principles, employing a generalized spin-flip Eliashberg function as well as ab initio computed phonon dispersions. Aiming at investigating the amount of electron-phonon mediated demagnetization in femtosecond laser-excited ferromagnets, the formalism is extended to treat laser-created thermalized as well as nonequilibrium, nonthermal hot electron distributions. Using the developed formalism we compute the phonon-induced spin lifetimes of hot electrons in Fe, Co, and Ni. The electron-phonon mediated demagnetization rate is evaluated for laser-created thermalized and nonequilibrium electron distributions. Nonthermal distributions are found to lead to a stronger demagnetization rate than hot, thermalized distributions, yet their demagnetizing effect is not enough to explain the experimentally observed demagnetization occurring in the subpicosecond regime.
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