Magnon instability driven by heat current in magnetic bilayers
Magnon instability driven by heat current in magnetic bilayers
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DOI：
10.1103/physrevb.92.224404
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发表时间：
2015-12-02
影响因子：
3.7
通讯作者：
Maekawa, Sadamichi
中科院分区：
文献类型：
--
作者：
Ohnuma, Yuichi;Adachi, Hiroto;Maekawa, Sadamichi
我们从理论上证明，在铁磁/顺磁双层，磁振子不稳定性伴随着一个千兆赫的微波发射可以简单地驱动通过一个温度偏置。采用多体理论研究声子热流对磁振子寿命的影响，我们表明，在低温下，当umklapp散射被抑制时，磁振子不稳定性发生，导致微波发射。目前的发现提供了关于自旋电流和热流相互作用的重要信息。
We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.