Smart Shape Memory Actuator Based on Monocrystalline Ni2FeGa Glass-Coated Microwire

Magnetic parameters necessary to obtain the highest variation of permeability during the phase transition in Ni
₂
FeGa glass-coated microwire are studied. It is shown that the martensitic transformation in glass-coated microwires is accompanied with a huge variation of permeability due to the different anisotropy of martensitic and austenitic phase. Variation of permeability can be adjusted up to 1600% by application of properly selected amplitude of excitation magnetic field. The highest variation of permeability was obtained for the field of 2.6 Oe, in which the permeability of austenite shows maximum, while permeability of martensite is still low.