Fast computation of magnetostatic fields by Non-uniform Fast Fourier Transforms

Details Fast computation of magnetostatic fields by Non-uniform Fast Fourier Transforms Fast computation of magnetostatic fields by Non-uniform Fast Fourier Transforms

2008-07-15

arxiv.org/abs/0807.2387v1

Applied Physics Letters 93, 13 (2008) 132508

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.2995850

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 logN, whereas the geometrically more versatile finite element methods (FEM) are bounded to N^4/3 in the best case. We report the implementation of a Non-uniform Fast Fourier Transform algorithm which brings a N logN convergence to FEM, with no loss of accuracy in the results.

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