Efficient approximate solutions to micromagnetic problems

摘要: The sixfold integral of magnetostatics ∫∫∫∫∫∫ div M{r}div M{r′}/|r′−r|d3r′ d3r is replaced by a local pseudo interaction λ2∫∫∫ div2 M{r}d3r in the expression for micromagnetic energy. A magnetic configuration M{λ,r} found minimization this energy each choice λ2. then evaluated few values These are used to interpolate between those find constrained minimum with integrals. method applied description intersection Bloch wall surface thick crystal magnetically soft materials characterized large saturation magnetization Ms and small uniaxial anisotropy Ku; that is, Ms2>Ku.