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| 001 | 819167 | ||
| 005 | 20210317110621.0 | ||
| 020 | _ | _ | |a 978-3-95806-168-2 |
| 024 | 7 | _ | |2 Handle |a 2128/12417 |
| 024 | 7 | _ | |2 ISSN |a 1866-1807 |
| 037 | _ | _ | |a FZJ-2016-04878 |
| 041 | _ | _ | |a English |
| 100 | 1 | _ | |0 P:(DE-Juel1)140304 |a Plötzing, Moritz Alexander |b 0 |e Corresponding author |g male |u fzj |
| 245 | _ | _ | |a Laser-Induced Ultrafast Electron- and Spin-Dynamics in the Electronic Band Structure of Co(001) |f - 2016-09-28 |
| 260 | _ | _ | |a Jülich |b Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag |c 2016 |
| 300 | _ | _ | |a II, 109, XXXIV S. |
| 336 | 7 | _ | |2 DataCite |a Output Types/Dissertation |
| 336 | 7 | _ | |2 ORCID |a DISSERTATION |
| 336 | 7 | _ | |2 BibTeX |a PHDTHESIS |
| 336 | 7 | _ | |0 2 |2 EndNote |a Thesis |
| 336 | 7 | _ | |0 PUB:(DE-HGF)11 |2 PUB:(DE-HGF) |a Dissertation / PhD Thesis |b phd |m phd |s 1475063056_1962 |
| 336 | 7 | _ | |2 DRIVER |a doctoralThesis |
| 490 | 0 | _ | |a Schriften des Forschungszentrums Jülich. Reihe Schlüsseltechnologien / Key Technologies |v 131 |
| 502 | _ | _ | |a Universität Duisburg, Diss., 2016 |b Dr. |c Universität Duisburg |d 2016 |
| 520 | _ | _ | |a In the last two decades, ultrafast magnetization dynamics has been the subject of a large number of experimental and theoretical investigations, however, without establishing a consistent picture up to now. The objective of the work presented in this thesis is to provide a new and profound perspective on the underlying mechanisms by a direct observation of the spin-dynamics in the electronic band structure of 3$\textit{d}$ ferromagnets using femtosecond time- and spin-resolved photoelectron spectroscopy of the full energy range of the valence bands. For this purpose, a novel experimental setup has been developed and commissioned that combines a modern, highly effcient spin detector with a state-of-the-art, table-top light source creating ultrashort extreme ultraviolet (XUV) pulses by laser-based high-order harmonic generation (HHG). The light source can be used in two operation modes, which provide XUV radiation with different wavelengths and photon fluxes. Static spin-resolved photoemission spectra of Co(001) films have been measured in both operation modes to find the optimum conditions for time-resolved experiments. Moreover, vacuum space-charge (VSC) effects within the dense electron clouds emitted by the femtosecond XUV pulses as well as the Coulomb interaction between electron clouds generated by XUV probe- and near-infrared (NIR) pump-pulses in a pump-probe experiment have been investigated in detail. The findings are used to determine and later minimize the influence of VSC on photoemission results. The NIR pump-pulses have been employed in time-resolved measurements to trigger ultrafast demagnetization in Co samples. Using the capabilities of the new experiment, we monitored the time evolution of the electron-dynamics by measuring spin-resolved spectra over a broad energy range fully covering the valence bands. To our knowledge, such measurements have been performed for the first time. The experiments lead to novel insights into the evolution of the spin system during an ultrafast demagnetization process, in particular by showing evidence of spin-mixing instead of a quenching of the exchange splitting as suggested by the Stoner-model. |
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