Ab initio theory for ultrafast magnetization dynamics with a dynamic band structure
| Autor: | Michael Haag, B. Y. Mueller, Manfred Fähnle |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Magnetization dynamics Condensed matter physics Demagnetizing field Ab initio Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetization Ferromagnetism 0103 physical sciences Physics::Atomic Physics 010306 general physics 0210 nano-technology Electronic band structure Ultrashort pulse Excitation |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 414:14-18 |
| ISSN: | 0304-8853 |
| Popis: | Laser-induced modifications of magnetic materials on very small spatial dimensions and ultrashort timescales are a promising field for novel storage and spintronic devices. Therefore, the contribution of electron–electron spin-flip scattering to the ultrafast demagnetization of ferromagnets after an ultrashort laser excitation is investigated. In this work, the dynamical change of the band structure resulting from the change of the magnetization in time is taken into account on an ab initio level. We find a large influence of the dynamical band structure on the magnetization dynamics and we illustrate the thermalization and relaxation process after laser irradiation. Treating the dynamical band structure yields a demagnetization comparable to the experimental one. |
| Databáze: | OpenAIRE |
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