CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of Co on magnetic property and phase stability of Ni–Mn–Ga ferromagnetic shape memory alloys: A first-principles study |
Tan Chang-Long(谭昌龙)a)† , Jiang Jiu-Xing(姜久兴)a), Tian Xiao-Hua(田晓华)a), and Cai Wei(蔡伟) b) |
a College of Applied Science, Harbin University of Science and Technology, Harbin 150080, China; b School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract The effect of Co content on magnetic property and phase stability of Ni50-xMn25Ga25Cox ferromagnetic shape memory alloys has been investigated using first-principles calculations. The total energy difference between paramagnetic and ferromagnetic state of austenite plays an important role in the magnetic transition. The high Curie temperature can be attributed to the stronger Co–Mn exchange interaction as compared to the Ni–Mn one. The phase stability of Ni50-xMn25Ga25Cox austenite increases with increasing Co content, which is discussed based on the electronic structure.
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Received: 07 March 2010
Revised: 15 April 2010
Accepted manuscript online:
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PACS:
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62.20.F-
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(Deformation and plasticity)
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64.70.K-
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71.15.-m
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(Methods of electronic structure calculations)
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71.20.Be
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(Transition metals and alloys)
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75.50.Cc
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(Other ferromagnetic metals and alloys)
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81.30.Kf
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(Martensitic transformations)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50901026), and the Youth Top-notch Innovative Talents Program of Harbin University of Science and Technology. |
Cite this article:
Tan Chang-Long(谭昌龙), Jiang Jiu-Xing(姜久兴), Tian Xiao-Hua(田晓华), and Cai Wei(蔡伟) Effect of Co on magnetic property and phase stability of Ni–Mn–Ga ferromagnetic shape memory alloys: A first-principles study 2010 Chin. Phys. B 19 107102
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