High spin polarization in CoFeMnGe equiatomic quaternary Heusler alloy
High spin polarization in CoFeMnGe equiatomic quaternary Heusler alloy
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DOI：
10.1063/1.4902831
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发表时间：
2014-11-28
影响因子：
3.2
通讯作者：
Hono, K.
中科院分区：
文献类型：
--
作者：
Bainsla, Lakhan;Suresh, K. G.;Hono, K.
报道了CoFeMnGe等原子四元Heusler合金的结构、磁性和自旋极化。发现该合金以立方Heusler结构（原型LiMgPdSn）结晶，具有相当数量的DO3无序。热分析结果表明，居里温度约为750 K，没有任何其他相变，直到熔化温度。磁化强度值与Slater-Pauling曲线预测值接近。用点接触和反射测量法推导出电流自旋极化率P = 0.70 +/-0.01。在5 - 300 K的温度范围内拟合了电阻率的温度依赖性，以检查半金属行为。考虑到高的自旋极化和居里温度，这种材料似乎是有前途的自旋电子学应用。(C)2014 AIP Publishing LLC.
We report the structure, magnetic property, and spin polarization of CoFeMnGe equiatomic quaternary Heusler alloy. The alloy was found to crystallize in the cubic Heusler structure (prototype LiMgPdSn) with considerable amount of DO3 disorder. Thermal analysis result indicated the Curie temperature is about 750 K without any other phase transformation up to melting temperature. The magnetization value was close to that predicted by the Slater-Pauling curve. Current spin polarization of P = 0.70 +/- 0.01 was deduced using point contact andreev reflection measurements. The temperature dependence of electrical resistivity has been fitted in the temperature range of 5-300 K in order to check for the half metallic behavior. Considering the high spin polarization and Curie temperature, this material appears to be promising for spintronic applications. (C) 2014 AIP Publishing LLC.