Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys

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2015
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Carva, Karel
Nieves, Pablo
Chubykalo-Fesenko, Oksana
Oppeneer, Peter M.
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FEMTOSPIN - Multiscale Modelling of Femtosecond Spin Dynamics
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Physical Review B. 2015, 92(5), 054412. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.92.054412
Zusammenfassung

A hierarchical multiscale approach to model the magnetization dynamics of ferromagnetic random alloys is presented. First-principles calculations of the Heisenberg exchange integrals are linked to atomistic spin models based upon the stochastic Landau-Lifshitz-Gilbert (LLG) equation to calculate temperature-dependent parameters (e.g., effective exchange interactions, damping parameters). These parameters are subsequently used in the Landau-Lifshitz-Bloch (LLB) model for multisublattice magnets to calculate numerically and analytically the ultrafast demagnetization times. The developed multiscale method is applied here to FeNi (permalloy) as well as to copper-doped FeNi alloys. We find that after an ultrafast heat pulse the Ni sublattice demagnetizes faster than the Fe sublattice for the here-studied FeNi-based alloys.

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530 Physik
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multiscale, ultrafast, magnetization, ferromagnetic
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ISO 690HINZKE, Denise, Unai ATXITIA, Karel CARVA, Pablo NIEVES, Oksana CHUBYKALO-FESENKO, Peter M. OPPENEER, Ulrich NOWAK, 2015. Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys. In: Physical Review B. 2015, 92(5), 054412. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.92.054412
BibTex
@article{Hinzke2015Multi-32000,
  year={2015},
  doi={10.1103/PhysRevB.92.054412},
  title={Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys},
  number={5},
  volume={92},
  issn={1098-0121},
  journal={Physical Review B},
  author={Hinzke, Denise and Atxitia, Unai and Carva, Karel and Nieves, Pablo and Chubykalo-Fesenko, Oksana and Oppeneer, Peter M. and Nowak, Ulrich},
  note={Article Number: 054412}
}
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