Emission of spin waves by a magnetic multilayer traversed by a current
Emission of spin waves by a magnetic multilayer traversed by a current
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DOI：
10.1103/physrevb.54.9353
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发表时间：
1996-10-01
影响因子：
3.7
通讯作者：
Berger, L
中科院分区：
文献类型：
--
作者：
Berger, L
在金属薄膜中，自旋波和巡游电子之间的相互作用在正常层和铁磁层之间的界面附近显著增强。这导致表征自旋动力学的吉尔伯特阻尼参数的局部增加。当直流电流穿过这个界面时，预计会发生自旋波的受激发射。超过一定的临界电流密度，自旋阻尼变成负的，预测会出现自发的磁化进动。这是注入式激光器的磁性模拟。一个额外的直流电压出现在界面上，其表达式类似于超导结上的约瑟夫森电压。
The interaction between spin waves and itinerant electrons is considerably enhanced in the vicinity of an interface between normal and ferromagnetic layers in metallic thin films. This leads to a local increase of the Gilbert damping parameter which characterizes spin dynamics. When a dc current crosses this interface, stimulated emission of spin waves is predicted to take place. Beyond a certain critical current density, the spin damping becomes negative; a spontaneous precession of the magnetization is predicted to arise. This is the magnetic analog of the injection laser. An extra dc voltage appears across the interface, given by an expression similar to that for the Josephson voltage across a superconducting junction.