Effect of Co on magnetic property and phase stability of Ni-Mn-Ga ferromagnetic shape memory alloys： A first-principles study

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 mag...

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Bibliographic Details
Published in:Chinese physics B 2010-10, Vol.19 (10), p.414-418
Main Author: Tan Chang-Long Jiang Jiu-Xing Tian Xiao-Hua Cai Wei
Format: Article
Language:English
Subjects:
相稳定性
磁性能
第一原理计算
铁磁形状记忆合金
高居里温度
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Summary: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 Niso-xMn25Ga25Cox austenite increases with increasing Co content, which is discussed based on the electronic structure.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/10/107102