Explaining the paradoxical diversity of ultrafast laser-induced demagnetization

B. Koopmans, G. Malinowski, F. Dalla Longa, D. Steiauf, M. Fähnle, T. Roth, M. Cinchetti, M. Aeschlimann

Research output: Contribution to journalArticleAcademicpeer-review

390 Citations (Scopus)

Abstract

Pulsed-laser-induced quenching of ferromagnetic order has intrigued researchers since pioneering works in the 1990s. It was reported that demagnetization in gadolinium proceeds within 100¿ps, but three orders of magnitude faster in ferromagnetic transition metals such as nickel. Here we show that a model based on electron–phonon-mediated spin-flip scattering explains both timescales on equal footing. Our interpretation is supported by ab initio estimates of the spin-flip scattering probability, and experimental fluence dependencies are shown to agree perfectly with predictions. A phase diagram is constructed in which two classes of laser-induced magnetization dynamics can be distinguished, where the ratio of the Curie temperature to the atomic magnetic moment turns out to have a crucial role. We conclude that the ultrafast magnetization dynamics can be well described disregarding highly excited electronic states, merely considering the thermalized electron system.
LanguageEnglish
Pages259-265
Number of pages7
JournalNature Materials
Volume9
Issue number3
DOIs
StatePublished - 2010

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Ultrafast lasers
Demagnetization
demagnetization
Magnetization
Scattering
magnetization
Electrons
Gadolinium
Electronic states
Curie temperature
gadolinium
Nickel
Magnetic moments
Pulsed lasers
scattering
Phase diagrams
lasers
Transition metals
Quenching
pulsed lasers

Cite this

Koopmans, B., Malinowski, G., Dalla Longa, F., Steiauf, D., Fähnle, M., Roth, T., ... Aeschlimann, M. (2010). Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. Nature Materials, 9(3), 259-265. DOI: 10.1038/NMAT2593
Koopmans, B. ; Malinowski, G. ; Dalla Longa, F. ; Steiauf, D. ; Fähnle, M. ; Roth, T. ; Cinchetti, M. ; Aeschlimann, M./ Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. In: Nature Materials. 2010 ; Vol. 9, No. 3. pp. 259-265
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Koopmans, B, Malinowski, G, Dalla Longa, F, Steiauf, D, Fähnle, M, Roth, T, Cinchetti, M & Aeschlimann, M 2010, 'Explaining the paradoxical diversity of ultrafast laser-induced demagnetization' Nature Materials, vol. 9, no. 3, pp. 259-265. DOI: 10.1038/NMAT2593

Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. / Koopmans, B.; Malinowski, G.; Dalla Longa, F.; Steiauf, D.; Fähnle, M.; Roth, T.; Cinchetti, M.; Aeschlimann, M.

In: Nature Materials, Vol. 9, No. 3, 2010, p. 259-265.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Koopmans,B.

AU - Malinowski,G.

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AU - Fähnle,M.

AU - Roth,T.

AU - Cinchetti,M.

AU - Aeschlimann,M.

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AB - Pulsed-laser-induced quenching of ferromagnetic order has intrigued researchers since pioneering works in the 1990s. It was reported that demagnetization in gadolinium proceeds within 100¿ps, but three orders of magnitude faster in ferromagnetic transition metals such as nickel. Here we show that a model based on electron–phonon-mediated spin-flip scattering explains both timescales on equal footing. Our interpretation is supported by ab initio estimates of the spin-flip scattering probability, and experimental fluence dependencies are shown to agree perfectly with predictions. A phase diagram is constructed in which two classes of laser-induced magnetization dynamics can be distinguished, where the ratio of the Curie temperature to the atomic magnetic moment turns out to have a crucial role. We conclude that the ultrafast magnetization dynamics can be well described disregarding highly excited electronic states, merely considering the thermalized electron system.

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Koopmans B, Malinowski G, Dalla Longa F, Steiauf D, Fähnle M, Roth T et al. Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. Nature Materials. 2010;9(3):259-265. Available from, DOI: 10.1038/NMAT2593