  In this paper, we investigate the stabilization of a system of piezoelectric
beams under (Coleman or Pipkin )-Gurtin thermal law with magnetic effect.
First, we study the Piezoelectric-Coleman-Gurtin system and we obtain an
exponential stability result. Next, we consider the Piezoelectric-Gurtin-Pipkin
system and we establish a polynomial energy decay rate of type $t^{-1}$
