Due to the large work output per unit volume per cycle and to the possibility for remote actuation via the use of magnetic fields, ferromagnetic shape memory materials are very attractive for applications to MEMS (micro-electro-mechanical systems). The general dynamic problem for such materials is very complex. For ferromagnetic shape memory materials like Ni2MnGa which exhibits both hard elastic moduli and is also a hard magnetic material, we propose a simplified theory in which the strain and the magnetization present in the material are very close to certain "energy wells".