Journal
PHYSICAL REVIEW B
Volume 92, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.054412
Keywords
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Funding
- Spanish Ministry of Economy and Competitiveness [MAT2013-47078-C2-2-P]
- Swedish Research Council (VR)
- European Community's Seventh Framework Programme (FP7), FEMTOSPIN [281043]
- EU FP7 Marie Curie Zukunftskolleg Incoming Fellowship Programme, University of Konstanz [291784]
- Swedish Infrastructure for Computing (SNIC)
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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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