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

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.

Keywords: ferromagnetic shape memory alloys magnetic properties martensitic transformations electronic band structure

Received: 07 March 2010
Revised: 15 April 2010
Published: 15 October 2010

PACS:	62.20.F-	(Deformation and plasticity)
	64.70.K-
	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)

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, Jiang Jiu-Xing, Tian Xiao-Hua, Cai Wei 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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