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1 Online-Ressource (91 Seiten, 5257 KB)
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Content:
In this work we investigated ultrafast demagnetization in a Heusler-alloy. This material belongs to the halfmetal and exists in a ferromagnetic phase. A special feature of investigated alloy is a structure of electronic bands. The last leads to the specific density of the states. Majority electrons form a metallic like structure while minority electrons form a gap near the Fermi-level, like in semiconductor. This particularity offers a good possibility to use this material as model-like structure and to make some proof of principles concerning demagnetization. Using pump-probe experiments we carried out time-resolved measurements to figure out the times of demagnetization. For the pumping we used ultrashort laser pulses with duration around 100 fs. Simultaneously we used two excitation regimes with two different wavelengths namely 400 nm and 1240 nm. Decreasing the energy of photons to the gap size of the minority electrons we explored the effect of the gap on the demagnetization dynamics. During this work we used for the first time ...
Note:
Dissertation Universität Potsdam 2019
Additional Edition:
Erscheint auch als Druck-Ausgabe Solopow, Sergej Wavelength dependent demagnetization dynamics in Co2MnGa Heusler-alloy Potsdam, 2019
Language:
English
Keywords:
Heuslersche Legierung
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Cobaltverbindungen
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Manganverbindungen
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Galliumverbindungen
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Entmagnetisierung
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Ultrakurzer Lichtimpuls
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Pump-Probe-Technik
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Hochschulschrift
DOI:
10.25932/publishup-42786
URN:
urn:nbn:de:kobv:517-opus4-427860
URL:
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URL:
https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-427860
URL:
https://d-nb.info/1218404639/34
Author information:
Rader, Oliver 1966-
Author information:
Föhlisch, Alexander
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