Details

Autor(en) / Beteiligte

• Grinstein, G
• Koch, R H

Titel

Coarse graining in micromagnetics

Ist Teil von

• Physical review letters, 2003-05, Vol.90 (20), p.207201-207201, Article 207201

Ort / Verlag

United States

Erscheinungsjahr

2003

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Numerical solutions of the micromagnetic Landau-Lifshitz-Gilbert equations provide valuable information at low temperatures (T), but produce egregious errors at higher T. For example, Curie temperatures are often overestimated by an order of magnitude. We show that these errors result from the use of block or coarse-grained variables, without a concomitant renormalization of the system parameters to account for the block size. Renormalization solves the problem of the Curie-point anomaly and improves the accuracy of more complicated micromagnetic simulations, even at low T.