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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

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【作者】 谭昌龙； 姜久兴； 田晓华； 蔡伟；

【Author】 Tan Chang-Long a) , Jiang Jiu-Xing a) , Tian Xiao-Hua a) , and Cai Wei 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

【机构】 College of Applied Science, Harbin University of Science and Technology； School of Materials Science and Engineering, Harbin Institute of Technology；

【摘要】 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.

【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.

【关键词】 ferromagnetic shape memory alloys； magnetic properties； martensitic transformations； electronic band structure；
【Key words】 ferromagnetic shape memory alloys； magnetic properties； martensitic transformations； electronic band structure；
【基金】 Project supported by the National Natural Science Foundation of China (Grant No. 50901026);the Youth Topnotch Inno-vative Talents Program of Harbin University of Science and Technology
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2010年10期
  • 【分类号】TG139.6
  • 【下载频次】24
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