Magnetostrictive Ni-Mn-Based Heusler Alloys

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Abstract

Heusler-type Ni-Mn-based ferromagnetic and metamagnetic shape memory alloys (FSMAs and MetaMSMAs) are the special multifunctional materials, particularly, suitable for the magnetic actuation owing their strong magnetoelastic coupling: anisotropic in FSMAs and isotropic in MetaMSMAs. The magnetostrictive properties of these two groups of materials are overviewed in the present article. It is shown experimentally and theoretically that the anisotropic magnetostriction plays the key role in the occurrence of the giant magnetostrain effect in the martensitic state of FSMAs, whereas MetaMSMAs exhibit a large magnetostrain due to the magnetic field induced martensitic transformation accompanied by a noticeable volume change.

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