J. Phys. IV France
Volume 112, October 2003
Page(s) 973 - 976

J. Phys. IV France
112 (2003) 973
DOI: 10.1051/jp4:20031043

Micromagnetics and micromechanics of Ni-Mn-Ga actuation

R.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