Energetics of magnetoelastic domains in ferromagnetic shape memory alloys

A. DeSimone, R. D. James

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations

Abstract

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 languageEnglish (US)
Pages (from-to)969-972
Number of pages4
JournalJournal De Physique. IV : JP
Volume112 II
DOIs
StatePublished - Oct 2003
EventInternational Conference on Martensitic Transformations - Espoo, Finland
Duration: Jun 10 2002Jun 14 2002

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