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

doi:10.1088/1674-1056/19/10/107102

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 107102-107102.doi: 10.1088/1674-1056/19/10/107102

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

谭昌龙¹, 姜久兴¹, 田晓华¹, 蔡伟²

(1)College of Applied Science, Harbin University of Science and Technology, Harbin 150080, China; (2)School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2010-03-07 修回日期:2010-04-15 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
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.

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

Received:2010-03-07 Revised:2010-04-15 Online:2010-10-15 Published:2010-10-15
Supported by:
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.

摘要/Abstract

摘要： The effect of Co content on magnetic property and phase stability of Ni_50-xMn₂₅Ga₂₅Co_x 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 Ni_50-xMn₂₅Ga₂₅Co_x 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 Ni_50-xMn₂₅Ga₂₅Co_x 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 Ni_50-xMn₂₅Ga₂₅Co_x austenite increases with increasing Co content, which is discussed based on the electronic structure.

Key words: ferromagnetic shape memory alloys, magnetic properties, martensitic transformations, electronic band structure

中图分类号: (Deformation and plasticity)

62.20.F-

71.15.-m (Methods of electronic structure calculations) 71.20.Be (Transition metals and alloys) 75.50.Cc (Other ferromagnetic metals and alloys) 81.30.Kf (Martensitic transformations)

谭昌龙, 姜久兴, 田晓华, 蔡伟. Effect of Co on magnetic property and phase stability of Ni–Mn–Ga ferromagnetic shape memory alloys: A first-principles study[J]. 中国物理B, 2010, 19(10): 107102-107102.

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[J]. Chin. Phys. B, 2010, 19(10): 107102-107102.

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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

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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