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铁磁共振诱导的安德烈夫电流。

Andreev current induced by ferromagnetic resonance.

机构信息

SPSMS, UMR-CEA/UJF-Grenoble, INAC, France.

出版信息

Phys Rev Lett. 2012 Aug 3;109(5):057002. doi: 10.1103/PhysRevLett.109.057002. Epub 2012 Jul 31.

Abstract

We study charge transport through a metallic dot coupled to a superconducting and a ferromagnetic lead with a precessing magnetization due to ferromagnetic resonance. Using the quasiclassical theory, we find that the magnetization precession induces a dc current in the subgap regime even in the absence of a bias voltage. This effect is due to the rectification of the ac spin currents at the interface with the ferromagnet; it exists in the absence of spin current in the superconductor. When the dot is strongly coupled to the superconductor, we find a strong enhancement in a wide range of parameters as compared to the induced current in the normal state.

摘要

我们研究了通过一个金属点与超导和铁磁引线耦合的电荷输运,由于铁磁共振,铁磁引线的磁化会进动。使用准经典理论,我们发现即使没有偏置电压,磁化进动也会在亚带隙区域中感应出直流电流。这种效应是由于在与铁磁体的界面处交流自旋电流的整流引起的;它存在于超导体内没有自旋电流的情况下。当点与超导体强耦合时,与正常状态下感应的电流相比,我们在广泛的参数范围内发现了强烈的增强。

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