Spin dynamics of magnetic nanoparticles : Beyond Brown s theory

Nowak, Ulrich; Mryasov, Oleg N.; Wieser, Robert; Guslienko, Konstantin; Chantrell, Roy W.

Spin dynamics of magnetic nanoparticles : Beyond Brown s theory

Files

Nowak73.pdf(356.33 KB)

Date

2005

Authors

Nowak, Ulrich

Mryasov, Oleg N.

Wieser, Robert

Guslienko, Konstantin

Chantrell, Roy W.

Publication type

Journal article

Published in

Physical Review B ; 72 (2005). - 172410

Abstract

An investigation of thermally induced spin dynamics of magnetic nanoparticles is presented. We use an atomistic model for the magnetic interactions within an effective, classical spin Hamiltonian constructed on the basis of first-principles calculations for L1 0 FePt. Using Langevin dynamics we investigate how the internal degrees of freedom affect the switching behavior at elevated temperatures. We find significant deviations from a single-spin model, arising from the temperature dependence of the intrinsic properties, from longitudinal magnetization fluctuations, and from both thermal and athermal finite-size effects. These findings underline the importance of atomistic simulations for the understanding of fast magnetization dynamics.

Subject (DDC)

530 Physics

Cite This

ISO 690

NOWAK, Ulrich, Oleg N. MRYASOV, Robert WIESER, Konstantin GUSLIENKO, Roy W. CHANTRELL, 2005. Spin dynamics of magnetic nanoparticles : Beyond Brown s theory. In: Physical Review B. 72, 172410. Available under: doi: 10.1103/PhysRevB.72.172410

BibTex

@article{Nowak2005dynam-9231,
  year={2005},
  doi={10.1103/PhysRevB.72.172410},
  title={Spin dynamics of magnetic nanoparticles : Beyond Brown s theory},
  volume={72},
  journal={Physical Review B},
  author={Nowak, Ulrich and Mryasov, Oleg N. and Wieser, Robert and Guslienko, Konstantin and Chantrell, Roy W.},
  note={Article Number: 172410}
}

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