Structure and Phase Transformation of Ferromagnetic Shape Memory Alloy Ni49Mn30Ga21 Fine Particles Prepared by Spark Erosion

Y. J. Tang, David Smith, Hao Hu, F. E. Spada, H. Harper, A. E. Berkowitz

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Ni49Mn30Ga21 fine particles were prepared by spark erosion. Most of the particles are spheres with sizes ranging from about 5 nm to 100 μm. The particles have the martensite structure at room temperature as indicated by X-ray diffraction (XRD). Measurements of the temperature dependence of the magnetization and high-temperature XRD patterns demonstrated that the particles undergo a martensite → austenite phase transformation in the range 35 °C-70 °C during heating, with ∼10 °C hysteresis for the austenite → martensite transformation upon cooling.

Original languageEnglish (US)
Pages (from-to)3405-3407
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 II
StatePublished - Sep 2003


  • Magnetic shape memory
  • Martensitic transformation
  • NiMnGa alloys
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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