Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys
2015
Online
Elektronische Ressource
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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Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys
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Veröffentlichung: | 2015 |
Medientyp: | Elektronische Ressource |
DOI: | 10.1103.PhysRevB.92.054412 |
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