Effect of Cr substitution for Fe on the spin polarization of Co2CrxFe1-xSi Heusler alloys
Effect of Cr substitution for Fe on the spin polarization of Co2CrxFe1-xSi Heusler alloys
复制标题
DOI：
10.1063/1.2769175
复制
发表时间：
2007-08-15
影响因子：
3.2
通讯作者：
Hono, K.
中科院分区：
文献类型：
--
作者：
Karthik, S. V.;Rajanikanth, A.;Hono, K.
用点接触Andreev反射法研究了Cr替代Fe对Co_2Cr_xFe_（1-x）Si合金自旋极化的影响。一个陡峭的增加，从P=0.57到P=0.64发生由一个小的替代的Cr为Fe的x=0.02，此后P值是恒定的较高的Cr浓度高达x=0.4。自旋极化的增加可以归因于实验发现的L2（1）有序的改善以及从头计算预测的半金属度在0
We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2CrxFe1-xSi alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L2(1) ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0