J. Phys. IV France 112 (2003) 973
Micromagnetics and micromechanics of Ni-Mn-Ga actuationR.C. O'Handley, D.I. Paul, M. Marioni, C.P. Henry, M. Richard, P.G. Tello and S.M. Allen
MIT, Cambridge, MA 02139, U.S.A.
An analytic model is described that accounts for thc nanoscale strain field that defines the twin-boundary width and energy density as well as the interaction of a 90° domain wall with such a twin boundary. These parameters are being used as input to micromagnetic calculations of the domain-wall profile perturbed by the twin-boundary strain field. Further, application of a magnetic field can displace the domain wall from a pinned twin boundary with the Zeeman energy being stored elastically in the domain-wall anisotropy energy.
© EDP Sciences 2003