Corresponding author. 49-203-3792969; 49- 203-3793665. E-mail addresses: [email protected] Hinzke), [email protected] Nowak). Journal Magnetism Magnetic Materials (2000) 365}372

For investigations thermally activated magnetization reversal systems of classical magnetic moments numerical methods desirable. present numerical studies which base time quanti"ed Monte Carlo methods where long-range dipole}dipole interaction calculated fast Fourier transformation. example, study models ferromagnetic nanowires comparing numerical results characteristic time reversal process also with numerical data from Langevin dynamics simulations where fast Fourier transformation method well established. Depending system geometry di!erent reversal mechanism occur coherent rotation, nucleation, curling. 2000 Elsevier Science B.V. rights reserved. PACS: 75.10.Hk; 75.40.Mg; 75.40.Gb Keywords: Classical spin models; Numerical simulation studies; Thermal activation; Magnetization reversal; Nanostructure