Concepts and Physical Phenomena in Magnetic Shape Memory Science

Abstract:

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.

• Periodical: Advanced Materials Research (Volume 52)
• Pages: 3-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.52.3
• Online since: June 2008
• Authors: Volodymyr A. Chernenko
• Keywords: Ferromagnetic Shape Memory Effect, Magnetoelastic Mechanism, Martensitic Transformation (MT), NiMnGa Alloy, Twin Rearrangement

References

This article has no references.