The improvement of CMOS technology reaches some fundamental limitations. For this reason alternatives are necessary to overcome the scaling and performances issues of the standard electronics. One of these is spintronic, in particular the subgroup of magnonics, since its main advantage is the power efficient computation. Indeed these devices exploit the spin as information carrier, rather than the charge, hence there is no Joule heating. Furthermore magnonic devices allow wave computing with higher functionality than classic computing. The goal of this master thesis is to study the majority gate device with different operating mode: continuous and pulse regime. The modeling of the system is performed through micromagnetic simulations, hence it has been possible to characterize the spin waves behaviour, thanks to the computation of the fundamental parameters describing their propagation in this specific device (chapter 4).