Towards multiscale modeling of magnetic materials : Simulations of FePt

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2008
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Kazantseva, Natalia
Chantrell, Roy W.
Chubykalo-Fesenko, Oksana
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Physical Review B. 2008, 77, 184428. Available under: doi: 10.1103/PhysRevB.77.184428
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The established methods for the numerical evaluation of magnetic material properties exist only in certain limits, including first-principles methods, spin models, and micromagnetics. In the present paper, we introduce a multiscale modeling approach, bridging the gaps between the three approaches above. The goal is to describe thermodynamic equilibrium and nonequilibrium properties of magnetic materials on length scales up to micrometers, starting from first principles. In the first step, we model, as an example, bulk FePt in the ordered Llo phase by using an effective, classical spin Hamiltonian that was constructed earlier on the basis of firstprinciples methods. The next step is to simulate this spin model by using the stochastic Landau-LifshitzGilbert equation. The temperature dependent micromagnetic parameters, which are evaluated with these atomistic simulations, are consequently used to develop a many macrospin micromagnetic approach, based on the Landau-Lifshitz-Bloch equation. As an example, we calculate the magnetization dynamics following a picosecond heat pulse resembling pump-probe experiments.

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ISO 690KAZANTSEVA, Natalia, Denise HINZKE, Ulrich NOWAK, Roy W. CHANTRELL, Unai ATXITIA, Oksana CHUBYKALO-FESENKO, 2008. Towards multiscale modeling of magnetic materials : Simulations of FePt. In: Physical Review B. 2008, 77, 184428. Available under: doi: 10.1103/PhysRevB.77.184428
BibTex
@article{Kazantseva2008Towar-9359,
  year={2008},
  doi={10.1103/PhysRevB.77.184428},
  title={Towards multiscale modeling of magnetic materials : Simulations of FePt},
  volume={77},
  journal={Physical Review B},
  author={Kazantseva, Natalia and Hinzke, Denise and Nowak, Ulrich and Chantrell, Roy W. and Atxitia, Unai and Chubykalo-Fesenko, Oksana},
  note={Article Number: 184428}
}
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