Theory of stripe domains in magnetic shape memory alloys |
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Authors: | N S Kiselev I E Dragunov A T Onisan U K Rößler A N Bogdanov |
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Institution: | (1) IFW Dresden, Postfach 270116, 01171 Dresden, Germany;(2) Donetsk Institute for Physics and Technology, 83114 Donetsk, Ukraine |
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Abstract: | The evolution of multivariant patterns in thin plates of magnetic shape memory materials with an applied magnetic field was
studied theoretically. A geometrical domain-model is considered composed of straight stripe-like martensite variants with
constant internal magnetization (high anisotropy limit) and magnetic domain wall orientation fixed by the twin boundaries.
Through integral transforms of the demagnetization energy, the micromagnetic energy is cast into a form convenient for direct
numerical evaluation and analytical calculations. The equilibrium geometrical parameters of multivariant patterns with straight
and oblique twin boundaries have been derived as functions of the applied field and the material parameters of a plate. It
is shown that the oblique multivariant states exist only in plates with thicknesses L larger than a certain critical value
L0. In samples with L<L0 a magnetic-field-driven transformation occurs directly between single variant states. |
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