Spin Pumping at the Magnetic Insulator (YIG)/Normal Metal (Au) Interfaces
Spin Pumping at the Magnetic Insulator (YIG)/Normal Metal (Au) Interfaces
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DOI：
10.1103/physrevlett.107.066604
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发表时间：
2011-08-02
影响因子：
8.6
通讯作者：
Wu, Mingzhong
中科院分区：
文献类型：
--
作者：
Heinrich, B.;Burrowes, C.;Wu, Mingzhong
利用铁磁共振研究了铁磁绝缘体(YIG)/正态金属（Au）界面上的自旋注入。通过比较裸露的YIG薄膜和覆盖Au/Fe/Au结构的薄膜的Gilbert阻尼来确定自旋混合电导。在Au/Fe/Au中，Fe层作为自旋汇，Gilbert阻尼参数alpha比在裸YIG中增加。特别地，对于9.0 nm YIG/2.0 nm Au/4.3 nm Fe/6.1 nm Au结构，YIG和Fe薄膜通过层间交换耦合耦合，交换耦合的YIG比裸露的YIG表现出更高的吉尔伯特阻尼。这种静态和动态耦合之间的关系为自旋泵的存在提供了直接证据。自旋动量在YIG界面上的传递非常有效，自旋混合电导g（上下箭头）类似或等于1.2 x 10(14) cm（-2）。
Spin injection across the ferrimagnetic insulator (YIG)/normal metal (Au) interface was studied by ferromagnetic resonance. The spin mixing conductance was determined by comparing the Gilbert damping in bare YIG films with those covered by a Au/Fe/Au structure. The Fe layer in Au/Fe/Au acted as a spin sink as displayed by an increased Gilbert damping parameter alpha compared to that in the bare YIG. In particular, for the 9.0 nm YIG/2.0 nm Au/4.3 nm Fe/6.1 nm Au structure, the YIG and Fe films were coupled by an interlayer exchange coupling, and the exchange coupled YIG exhibited an increased Gilbert damping compared to the bare YIG. This relationship between static and dynamic coupling provides direct evidence for spin pumping. The transfer of spin momentum across the YIG interface is surprisingly efficient with the spin mixing conductance g(up down arrow) similar or equal to 1.2 x 10(14) cm(-2).