Unexpectedly marginal effect of electronic correlations on ultrafast demagnetization after femtosecond laser-pulse excitation
| Autor: | Michael Haag, Manfred Fähnle, W. Weng, B. Y. Mueller, Haonan Huang, J. Briones, Nicolas Teeny, Tilmann Kuhn |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Demagnetizing field Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Pulse (physics) law.invention Condensed Matter::Materials Science Ferromagnetism law Condensed Matter::Superconductivity 0103 physical sciences Femtosecond Physics::Atomic and Molecular Clusters Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Ultrashort pulse Excitation Fermi Gamma-ray Space Telescope |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.224439 |
| Popis: | The treatment of ultrafast demagnetization after femtosecond laser-pulse excitation of a ferromagnetic film is usually done by a theory based on Fermi's golden rule which neglects the effects of electronic correlations. In the present paper the contribution of spin-flip electron-phonon scatterings to the ultrafast demagnetization of Ni is calculated by this theory and by the density-matrix theory in which the correlations are taken into account. The unexpected result is that the correlations which are essential for the ultrafast dynamics of nonmagnetic phenomena have only a marginal effect for the considered magnetic problem. From this point of view the use of Fermi's golden rule in all former papers on ultrafast demagnetization is justified. |
| Databáze: | OpenAIRE |
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