Effect of Cr substitution for Fe on the spin polarization of Co2CrxFe1-xSi Heusler alloys

被引：36

作者：

Karthik, S. V. ^{[1
]}

Rajanikanth, A. ^{[1
]}

Nakatani, T. M. ^{[1
]}

Gercsi, Z. ^{[1
]}

Takahashi, Y. K. ^{[1
]}

Furubayashi, T. ^{[1
]}

Inomata, K. ^{[1
]}

Hono, K. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 04期

基金：

日本学术振兴会;

关键词：

D O I：

10.1063/1.2769175

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 <= x <= 0.5. We propose the composition range of 0.02 <= x <= 0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance. (C) 2007 American Institute of Physics.

引用

页数：6

共 14 条

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