Structure, magnetic property, and spin polarization of Co2FeAlxSi1−x Heusler alloys
Structure, magnetic property, and spin polarization of Co2FeAlxSi1−x Heusler alloys
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DOI：
10.1063/1.2767229
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发表时间：
2007-08
影响因子：
3.2
通讯作者：
T. Nakatani;A. Rajanikanth;Z. Gercsi;Y. Takahashi;K. Inomata;K. Hono
中科院分区：
文献类型：
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作者：
T. Nakatani;A. Rajanikanth;Z. Gercsi;Y. Takahashi;K. Inomata;K. Hono
报道了用点接触安德列夫反射法测量Co2FeAlxSi1−x(x=0.0，0.3，0.5，0.7)块体合金的自旋极化。所有的Co2FeAlxSi1−x合金都具有L21结构以及A2和B2型无序。制备了几种非化学计量比合金(CoxFeyAl0.5Si0.5)，以了解成分偏离化学计量比对自旋极化的影响。用Al取代Si后，自旋极化从x=0.0时的0.57±0.01变化到x=0.5时的最大值0.60±0.01。非化学计量比合金的自旋极化系数为0.57−0.60±0.01。用从头算方法解释了Al加成的影响以及无序对磁性和电子结构的影响。
We report the spin polarization of Co2FeAlxSi1−x (x=0.0, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the Co2FeAlxSi1−x alloys had an L21 structure along with A2- and B2-type disorder. Several off-stoichiometric alloys (CoxFeyAl0.5Si0.5) were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from 0.57±0.01 for x=0.0 to a maximum value of 0.60±0.01 for x=0.5. The off-stoichiometric alloys had spin polarizations of 0.57−0.60±0.01. Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.