Spin-injection Terahertz Radiation in Magnetic Junctions

被引：0
|
作者：
Chigarev, S. G. [1 ]
Epshtein, E. M. [1 ]
Gulyaev, Yu. V. [1 ]
Malikov, I. V. [2 ]
Mikhailov, G. M. [2 ]
Shofman, V. G. [1 ]
Zilberman, P. E. [1 ]
机构：
[1] VA Kotelnikov FIRE RAS, Inst Radio Engn & Elect, Fryazino 141190, Moscow District, Russia
[2] Russian Acad Sci, Inst Microelect Technol & High Pur Mat, Chernogolovka 142432, Russia
来源：
MAGNETISM AND MAGNETIC MATERIALS V | 2012年 / 190卷
基金：
俄罗斯基础研究基金会;
关键词：
S-d exchange interaction and energy splitting; Spin injection by current; Spin subband population; Effective spin temperature; Radiation transitions between subbands; Quantum efficiency of the radiation; Stimulated radiation processes;
D O I：
10.4028/www.scientific.net/SSP.190.153
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electromagnetic radiation of 1 - 10 THz range is observed at room temperature in a structure with a point contact between a ferromagnetic rod and a thin ferromagnetic film under electric current of high enough density. The radiation is due to nonequilibrium spin injection between the components of the structure. By estimates, the injection can lead to inverted population of the spin subbands. The radiation power exceeds by orders of magnitude the thermal background (with the Joule heating taking into account) and follows the current without inertia. Efficiency of the oscillator depends strongly on the material used and quantum efficiency may exceed the unity. It means the stimulated radiation processes play an important role.
引用
收藏
页码：153 / +
页数：2
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