Magnetostatic Field Computation in Thin Films Based on k-Space Fast Convolution With Truncated Green’s Function

A
$k$
-space approach for magnetostatic field computation in magnetic thin films is proposed. The convolution of truncated Green’s function and the magnetization field is computed via the fast Fourier transform, where the discretization process is done in the
$k$
-space (Fourier space) instead of the ordinary space. In this respect, removal of the influence of replica in the ordinary space when the magnetostatic field is reconstructed is achieved. The accuracy and the efficiency of the proposed approach are investigated.