Journal
PHYSICAL REVIEW B
Volume 94, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.220408
Keywords
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Funding
- Department of Energy (DOE) Office of Basic Energy Sciences X-Ray Scattering Program [DE-SC0002002]
- Gordon and Betty Moore Foundation EPiQS Award [GBMF4538]
- Swedish Research Council (VR)
- EU [281043]
- Wallenberg Foundation [2015.0060]
- German Science Foundation [SFB/TRR 173]
- Czech Science Foundation [15-08740Y]
- IT4Innovations Project [LM2015070]
- COST Action MP1306 EUSpec
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Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond time scales has been a long-standing question in condensed matter physics. Here, we use ultrafast high harmonics to measure time-, energy-, and angle-resolved M-edge magnetic asymmetry spectra for Co films after optical pumping to induce ultrafast demagnetization. This provides a complete data set that we can compare with advanced ab initio magneto-optical calculations. Our analysis identifies that the dominant mechanisms contributing to ultrafast demagnetization on time scales up to several picoseconds are a transient reduction in the exchange splitting and the excitation of ultrafast magnons. Surprisingly, we find that the magnon contribution to ultrafast demagnetization is already strong on subpicosecond time scales, while the reduction in exchange splitting persists to several picoseconds.
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