Concepts and Physical Phenomena in Magnetic Shape Memory Science
The magnetically weakly anisotropic cubic Ni-Mn-Ga Heusler alloys exhibit martensitic transformation resulting in martensitic phases with elastically soft crystal lattices and strong magnetocrystalline anisotropies. The magnetic state of these martensites is coupled with a highly mobile twin structure through the ordinary magnetoelastic interactions giving rise to a giant magnetic-field-induced-strain effect. This effect is the key ingredient of a new scientific field. In the present article, the basic phenomena and concepts of this field, such as lattice instability, soft-mode behavior, electron concentration, ferromagnetic shape memory effect, magnetic-field-induced superelasticity, twinning strain-induced change of magnetization, and magnetoelastic mechanism of magnetostress are briefly reviewed.
Lluis Mañosa, P.K. Mukhopadhyay and S.R. Barman
V. A. Chernenko "Concepts and Physical Phenomena in Magnetic Shape Memory Science", Advanced Materials Research, Vol. 52, pp. 3-14, 2008