Co-occurrence of magnetic and structural transitions in the Heusler alloy Ni53Mn25Ga22

Co-occurrence of magnetic and structural transitions in the Heusler alloy Ni53Mn25Ga22
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Heusler 合金 Ni53Mn25Ga22 中磁性和结构转变的共生

DOI:
10.1063/1.1457528
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发表时间:
2002-02
期刊:
Appl. Phys. Lett.
影响因子:
--
通讯作者:
H.B.Xu
H.B.Xu
中科院分区:
其他
文献类型:
--
作者:
C.B.Jiang;G. Feng;H.B.Xu

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在非化学计量的Ni53Mn25Ga22合金中观察到磁性和结构转变的同时发生,该合金在高于化学计量的Ni2MnGa合金的居里温度(103 °C)的磁性转变温度(134 °C)下经历从铁磁马氏体到顺磁奥氏体的逆马氏体转变。  磁场对相变温度的影响被发现是两个数量级以上,在本合金比在Ni2MnGa由于在奥氏体中的铁磁状态的情况下。这可能打开在低磁场下利用NiMnGa合金的可能性。
A co-occurrence of magnetic and structural transitions was observed in a nonstoichiometric Ni53Mn25Ga22 alloy which undergoes a reverse martensitic transformation from ferromagnetic martensite to paramagnetic austenite at a magnetic transition temperature (134 °C) higher than the Curie temperature of the stoichiometric Ni2MnGa alloy (103 °C). The effect of the magnetic field on the phase transition temperature was found to be two orders of magnitude greater in the present alloy than in Ni2MnGa due to the absence of the ferromagnetic state in austenite. This may open the possibility of utilizing NiMnGa alloys at a low magnetic field.
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