Magnetic properties and magnetostructural phase transitions in Ni2+xMn1-xGa shape memory alloys

被引：137
|
作者：
Khovailo, VV
Novosad, V
Takagi, T
Filippov, DA
Levitin, RZ
Vasil'ev, AN
机构：
[1] Natl Inst Adv Ind Sci & Technol, Tohoku Ctr, Sendai, Miyagi 9838551, Japan
[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[3] Tohoku Univ, Inst Fluid Sci, Sendai, Miyagi 9808577, Japan
[4] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119899, Russia
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 17期
基金：
俄罗斯基础研究基金会; 日本学术振兴会;
关键词：
D O I：
10.1103/PhysRevB.70.174413
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A systematic study of magnetic properties of Ni2+xMn1-xGa (0less than or equal toxless than or equal to0.19) Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of spontaneous magnetization, M-s(T), jumps DeltaM at structural phase transitions were determined. Virtual Curie temperatures of martensite were estimated from the comparison of magnetization in martensitic and austenitic phases. Both saturation magnetic moments in the ferromagnetic state and effective magnetic moments in paramagnetic state of Mn and Ni atoms were estimated and the influence of delocalization effects on magnetism in these alloys was discussed. The experimental results obtained show that the shift of martensitic transition temperature depends weakly on composition. The values of this shift are in good correspondence with the Clapeyron-Clausius formalism taking into account the experimental data on latent heat at martensite-austenite transformations.
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页码：1 / 6
页数：6
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