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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >The effect of iron addition on the spin polarization and magnetic properties of Co2CrGa Heusler alloy
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The effect of iron addition on the spin polarization and magnetic properties of Co2CrGa Heusler alloy

机译：铁的添加对Co2CrGa Heusler合金的自旋极化和磁性的影响

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摘要

We report the effect of the substitution of Co with Fe in Co2-xFexCrGa Heusler alloys ( x = 0-0.3) on their magnetic property, electronic band structure and spin polarization, both experimentally and theoretically. The intrinsic spin polarization of Co2CrGa measured by the point-contact Andreev reflection method was P = 0.61 +/- 0.02, whereas a small substitution with Fe for Co of x = 0.1 enhanced the spin polarization to P = 0.67 +/- 0.03 regardless of a weak L2(1) order. Ab initio calculations for both the perfectly L2(1) ordered and partially disordered structures showed that the small amount of Fe induced a robustness of the spin polarization against the structural disorder. These results demonstrate the effect of the Fe addition in Co2CrGa is to improve the spin polarization even with the presence of chemical disorder.
机译：我们在实验和理论上报告了在Co2-xFexCrGa Heusler合金（x = 0-0.3）中用Fe替代Co对它们的磁性，电子能带结构和自旋极化的影响。通过点接触安德烈耶夫反射法测得的Co2CrGa的固有自旋极化为P = 0.61 +/- 0.02，而用Fe代替Co的x = 0.1的少量自旋极化将自旋极化提高到P = 0.67 +/- 0.03，无论弱L2（1）阶。完全L2（1）有序和部分无序结构的从头算计算表明，少量的Fe诱导了自旋极化对结构无序的鲁棒性。这些结果证明即使在存在化学无序的情况下，在Co 2 CrGa中添加Fe的作用是改善自旋极化。

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