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11 July 2002 Microscopic considerations for models of ferromagnetic shape memory actuation
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Micro magnetic and analytic models have been sued to describe the equilibrium twin structure and quasistatic actuation behavior of ferromagnetic shape memory alloys. However, these models do not incorporate microscopic aspects of the twin-boundary strain field, interactions with defects or non-equilibrium behavior. A model is described that accounts for the interaction of a 90 degree domain wall with such a twin boundary. 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 anisotorpy energy. Finally, the departure of the magnetization and twin structure from equilibrium configurations can be incorporated in thermodynamic models to describe AC behavior and hysteresis.
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Robert C. O'Handley, David I. Paul, Miguel A. Marioni, Christopher P. Henry, Marc Richard, Jorge Feuchtwanger, Pablo G. Tello, and Samuel M. Allen "Microscopic considerations for models of ferromagnetic shape memory actuation", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002);

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