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Growth and characterization of ferromagnetic shape memory alloy Co50Ni20FeGa29 single crystals |
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| Authors: | X.F. Dai H.Y. Wang L.J. Chen X.F. Duan J.L. Chen G.H. Wu Hao Zhu John Q. Xiao |
| Affiliation: | aState Key Laboratory for Magnetism and Beijing Laboratory of Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China bDepartment of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
| Abstract: | Single crystals of Co50Ni20FeGa29 with B2 phase have been obtained in a deep supercooling condition. The interface-facets and the segregation effect lead to the formation of ordered defects that store a directional internal stress. These defects give to a large energy barrier that leads to a very sharp martensitic transformation within a temperature window of only 2 K. The single crystals show good shape memory effect and superelasticity, which are anisotropic between the growth direction [0 0 1] and its equivalent direction [0 1 0]. The anisotropic behaviors are attributed to the directional internal stress caused by the ordered defects. |
| Keywords: | A1. Characterization A1. Defects A2. Czochralski method B2. Ferromagnetic shape memory alloys B2. Magnetic materials |
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