Magnetization and spin polarization of Co2-xFexMnSi Heusler alloys
Magnetization and spin polarization of Co2-xFexMnSi Heusler alloys
复制标题
Co2-xFexMnSi Heusler 合金的磁化和自旋极化
DOI：
10.1088/1742-6596/400/3/032082
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
M. Hiroi
中科院分区：
文献类型：
--
作者：
I. Shigeta;S. Urakawa;M. Ito;M. Hiroi
本文报道了Co2-xFexMnSiHeusler合金的磁化和自旋极化. Co2-xFexMnSiHeusler合金是一种半金属材料，具有较高的居里温度。Co2-xFexMnSi（0≤ x≤ 1.5）的饱和磁化强度服从Slater-Pauling规则，表明这些化合物是HM化合物。因此，利用Andreev反射技术，利用Co2-xFexMnSi/Pb平面结测量了Co2-xFexMnSi Heusler合金的自旋极化.得到的微分电导能够很好地拟合由修改的Blonder-Tinkham-Klapwijk理论。从自旋极化测量的分析，我们已经发现的自旋极化的P= 0.50 x= 0.5和P= 0.52 x= 1.25。因此，自旋极化是不太依赖于不同浓度的x。
We report magnetization and spin polarization of Co 2-x Fe x MnSi Heusler alloys. Co 2-x Fe x MnSi Heusler alloys are theoretically predicted to be half-metals (HM's) and generally possess high Curie temperature. The fact that the saturation magnetization of Co 2-x Fe x MnSi for 0≤ x≤ 1.5 obeys the Slater-Pauling rule reveals that those compounds are experimentally expected to be HM's. Therefore, the spin polarization of Co 2-x Fe x MnSi Heusler alloys was determined by the Andreev reflection technique using Co 2-x Fe x MnSi/Pb planar-type junctions. The obtained differential conductance was able to be fitted very well by the modified Blonder-Tinkham-Klapwijk theory. From analysis of spin polarization measurements, we have found the spin polarization of P= 0.50 for x= 0.5 and P= 0.52 for x= 1.25, respectively. Consequently, the spin polarization was less dependent of different concentrations of x.