Atomic ordering and magnetic properties in Ni2Mn(GaxAl1-x) Heusler alloys
Atomic ordering and magnetic properties in Ni2Mn(GaxAl1-x) Heusler alloys
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DOI：
10.1016/j.actamat.2008.05.034
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发表时间：
2008-10-01
期刊：
影响因子：
9.4
通讯作者：
Ishida, K.
中科院分区：
文献类型：
--
作者：
Ishikawa, H.;Umetsu, R. Y.;Ishida, K.
采用差示扫描量热、磁强测量、x射线衍射和透射电镜观察等方法研究了Ni2Mn（GaxAl1-x）合金的相稳定性和磁性能。从B2相到L2(1)相的有序-无序转变温度T-t（B2/L21）随x的增加呈线性增加，磁性能与退火条件有关。特别是在Ni2Mn（Ga0.5Al0.5）合金中，随着退火温度的变化，原子有序状态可以从B2变为L2(1)。完全有序L2(1)相的磁性为铁磁性，居里温度T-C约为380 K，而B2相的磁性为反铁磁性，Neel温度T-N约为300 K。(C) 2008材料学报Elsevier Ltd.出版。版权所有。
The phase stability and magnetic properties of Ni2Mn(GaxAl1-x) alloys were studied by differential scanning calorimetric and magnetometric measurements, and X-ray diffraction and transmission electronic microscopic observations. The order-disorder transition temperature from the B2 to the L2(1) phase, T-t(B2/L21), linearly increases with increasing x and the magnetic properties depend on the annealing conditions. Especially in the Ni2Mn(Ga0.5Al0.5) alloy, the condition of the atomic order can be varied from a B2 to an L2(1) structure by the annealing temperature. The magnetic property of the fully ordered L2(1) phase is ferromagnetic with a Curie temperature T-C of about 380 K, while that in the B2 phase is antiferromagnetic with the Neel temperature T-N of about 300 K. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.