Spin injection in mesoscopic silver wires: Experimental test of resistance mismatch

被引：87

作者：

Godfrey, R ^{[1
]}

Johnson, M ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.96.136601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The spin polarization of current injected from a Permalloy electrode into a mesoscopic Ag wire is measured for samples with very low interface resistance. The observed value of 22.3%+/- 1.6% at 79 K is an order of magnitude larger than values previously reported for low resistance interfaces and about 4 times larger than predictions of the common resistance mismatch model. These results demonstrate that high resistance barriers are not necessary for efficient spin injection.

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