Shape memory ferromagnets

Details Shape memory ferromagnets Shape memory ferromagnets

2003-11-19

arxiv.org/abs/cond-mat/0311433v1

Physics-Uspekhi 46 (2003), pp. 559-588

Physics

Condensed Matter

Materials Science

review on ferromagnetic shape memory alloys (FSMAs)

Scientific paper

10.1070/PU2003v046n06ABEH001339

In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field. Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energetically favorable compared to the reorientation of magnetic moments. In ferromagnetic Heusler alloys Ni$_{2+x}$Mn$_{1-x}$Ga the Curie temperature exceeds the martensitic transformation temperature. The fact that these two temperatures are close to room temperature offers the possibility of magnetically controlling the shape and size of ferromagnets in the martensitic state. In Ni$_{2+x}$Mn$_{1-x}$Ga single crystals, a reversible strain of $\sim 6$% is obtained in fields of $\sim 1$ T.

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