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Related Experiment Videos

Coarse graining in micromagnetics.

G Grinstein1, R H Koch

  • 1IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA.

Physical Review Letters
|June 6, 2003
PubMed
Summary
This summary is machine-generated.

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Numerical simulations of micromagnetics using the Landau-Lifshitz-Gilbert equations show errors at high temperatures. Renormalization of parameters corrects Curie temperature anomalies and enhances simulation accuracy.

Area of Science:

  • Physics
  • Materials Science
  • Computational Science

Background:

  • Numerical solutions of Landau-Lifshitz-Gilbert equations are crucial for micromagnetics.
  • These simulations exhibit significant inaccuracies at elevated temperatures, notably overestimating Curie temperatures.

Purpose of the Study:

  • To identify the source of egregious errors in micromagnetic simulations at higher temperatures.
  • To propose a method for improving the accuracy of these simulations.

Main Methods:

  • Investigating errors arising from block or coarse-grained variables in numerical solutions.
  • Implementing renormalization of system parameters to account for block size.

Main Results:

  • Errors in micromagnetic simulations stem from unrenormalized block variables.

Related Experiment Videos

  • Renormalization effectively resolves the Curie-point anomaly.
  • Improved accuracy in micromagnetic simulations is achieved, even at low temperatures.

    • Conclusions:

    • Renormalization is essential for accurate micromagnetic simulations, particularly at higher temperatures.
    • The proposed method corrects Curie temperature overestimation and enhances overall simulation fidelity.