In recently developed ferromagnetic shape-memory alloys (e.g., NiMnGa or FePd compounds), martensitic transformations, hence large changes of shape, can be triggered by an applied magnetic field. The macroscopic deformations exhibited by such ferromagnetic martensites in response to applied magneto-mechanical loads correspond to easy deformation paths achieved through the cooperative evolution of microscopic magnetoelastic domains. We discuss a variational model for these materials which includes elastic, magnetocrystalline and magnetostatic energies. Macroscopic deformations are computed as averages on energy minimizing elastic domain structures. Magnetostriction curves are computed by solving parametrically a discrete, constrained optimization problem.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal De Physique. IV : JP|
|State||Published - Oct 2003|
|Event||International Conference on Martensitic Transformations - Espoo, Finland|
Duration: Jun 10 2002 → Jun 14 2002