Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness

Atxitia, Unai; Hinzke, Denise; Chubykalo-Fesenko, Oksana; Nowak, Ulrich; Kachkachi, Hamid; Mryasov, Oleg N.; Evans, Richard Francis L.; Chantrell, Roy W.

Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness

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Datum

2010

Autor:innen

Atxitia, Unai

Hinzke, Denise

Chubykalo-Fesenko, Oksana

Nowak, Ulrich

Kachkachi, Hamid

Mryasov, Oleg N.

Evans, Richard Francis L.

Chantrell, Roy W.

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review B. 2010, 82(13), 134440. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.82.134440

Zusammenfassung

For finite-temperature micromagnetic simulations the knowledge of the temperature dependence of the exchange stiffness plays a central role. We use two approaches for the calculation of the thermodynamic exchange parameter from spin models: (i) based on the domain-wall energy and (ii) based on the spin-wave dispersion. The corresponding analytical and numerical approaches are introduced and compared. A general theory for the temperature dependence and scaling of the exchange stiffness is developed using the classical spectral density method. The low-temperature exchange stiffness A is found to scale with magnetization as m1.66 for systems on a simple cubic lattice and as m1.76 for an FePt Hamiltonian parametrized through ab initio calculations. The additional reduction in the scaling exponent, as compared to the mean-field theory (A~ m2), comes from the nonlinear spin-wave effects.

Fachgebiet (DDC)

530 Physik

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ISO 690

ATXITIA, Unai, Denise HINZKE, Oksana CHUBYKALO-FESENKO, Ulrich NOWAK, Hamid KACHKACHI, Oleg N. MRYASOV, Richard Francis L. EVANS, Roy W. CHANTRELL, 2010. Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness. In: Physical Review B. 2010, 82(13), 134440. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.82.134440

BibTex

@article{Atxitia2010Multi-943,
  year={2010},
  doi={10.1103/PhysRevB.82.134440},
  title={Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness},
  number={13},
  volume={82},
  issn={1098-0121},
  journal={Physical Review B},
  author={Atxitia, Unai and Hinzke, Denise and Chubykalo-Fesenko, Oksana and Nowak, Ulrich and Kachkachi, Hamid and Mryasov, Oleg N. and Evans, Richard Francis L. and Chantrell, Roy W.},
  note={Article Number: 134440}
}

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