“…The model usually used for modelizing ferromagnetic materials is the micromagnetism, introduced by W.-F. Brown in 60'. This model, based upon a thermodynamic analysis of the ferromagnetic phenomenon, is quickly recalled in section 1 (see also [1,3,5,6]). In a second section, we focus on the discretization of the stray field (more details are given in [4,8] while its use is described in [7,10]).…”