Publication
Physical Review Letters
Paper

Coarse graining in micromagnetics

Abstract

The problem of overestimated Curie temperatures is solved by an appeal to the low-temperature renormalization of fixed-length spin models. The main point is that the effective exchange constant of the coarse-grained system experiences a temperature-dependent renormalization, thus producing a phase transition at the proper temperature. Furthermore, it is demonstrated that even at temperatures far below criticality, magnetic properties computed numerically from the LLG equations depend on block size.

Date

Publication

Physical Review Letters

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