Fast computation of magnetostatic fields by nonuniform fast Fourier transforms

Kritsikis, Evaggelos; Toussaint, Jean-Christophe; Fruchart, Olivier; Szambolics, Helga; Buda-Prejbeanu, Liliana
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p132508
Academic Journal
The bottleneck of micromagnetic simulations is the computation of the long-ranged magnetostatic fields. This can be tackled on regular N-node grids with fast Fourier transforms in time N log N, whereas the geometrically more versatile finite element methods (FEMs) are bounded to N4/3 in the best case. We report the implementation of a nonuniform fast Fourier transform algorithm, which brings a N log N convergence to FEM, with no loss of accuracy in the results.


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