Martensitic transformation and magnetic properties of Heusler alloy Ni-Fe-Ga ribbon

Z. H. Liu, H. Liu, Xixiang Zhang, M. Zhang, X. F. Dai, H. N. Hu, J. L. Chen, G. H. Wu

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The martensitic transformation and magnetic properties of ferromagnetic shape memory alloy Ni 50+x Fe 25-x Ga 25 (x=-1, 0, 1, 2, 3, 4) ribbons have been systematically studied. It has been found that with the increase of Ni concentration, the martensitic transformation temperature increases, but the Curie temperature decreases. Both the two-step thermally induced structural transformation and the one-step transition have been observed in NiFeGa alloys with different compositions. It is found that the two-step transition became the one-step transition after the ribbon being heat treated at 873 K or higher. X-ray diffraction patterns show that only L21→B2 transition occurs in the samples treated at 873 K, while the γ phase will form in the samples treated at higher temperature. Transmission electron microscopy (TEM) studies show that the alloys with martensitic transformation temperature above the room temperature are non-modulated martensite with the large domain size, being different from the stoichiometric Ni 2 FeGa alloy that is a modulated martensite with small domain size. The influences of Fe substitution for Ni in Ni 2 FeGa on the saturation magnetization and exchange interaction are also discussed.

Original languageEnglish (US)
Pages (from-to)214-220
Number of pages7
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume329
Issue number3
DOIs
StatePublished - Aug 23 2004

Keywords

  • Heusler alloy
  • Magnetism
  • Martensitic transformation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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