Magnetic-field-induced shape recovery by reverse phase transformation

R. Kainuma, Y. Imano, W. Ito, Y. Sutou, H. Morito, S. Okamoto, O. Kitakami, K. Oikawa, A. Fujita, T. Kanomata, K. Ishida

Research output: Contribution to journalArticlepeer-review

1365 Citations (Scopus)

Abstract

Large magnetic-field-induced strains1 have been observed in Heusler alloys with a body-centred cubic ordered structure and have been explained by the rearrangement of martensite structural variants due to an external magnetic field1-3. These materials have attracted considerable attention as potential magnetic actuator materials. Here we report the magnetic-field-induced shape recovery of a compressively deformed NiCoMnIn alloy. Stresses of over 100 MPa are generated in the material on the application of a magnetic field of 70 kOe; such stress levels are approximately 50 times larger than that generated in a previous ferromagnetic shape-memory alloy 4. We observed 3 per cent deformation and almost full recovery of the original shape of the alloy. We attribute this deformation behaviour to a reverse transformation from the antiferromagnetic (or paramagnetic) martensitic to the ferromagnetic parent phase at 298 K in the Ni45Co 5Mn36.7In13.3 single crystal.

Original languageEnglish
Pages (from-to)957-960
Number of pages4
JournalNature
Volume439
Issue number7079
DOIs
Publication statusPublished - 2006 Feb 23

ASJC Scopus subject areas

  • General

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