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.
- Magnetic shape memory
- Martensitic transformation
- NiMnGa alloys
- X-ray diffraction
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering