Magnon instability driven by heat current in magnetic bilayers

被引：8
作者：
Ohnuma, Yuichi [1 ,2 ]
Adachi, Hiroto [2 ,3 ]
Saitoh, Eiji [1 ,2 ,3 ,4 ]
Maekawa, Sadamichi [2 ,3 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
[3] Japan Sci & Technol Agcy, Spin Quantum Rectificat Project, ERATO, Sendai, Miyagi 9808577, Japan
[4] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 22期
关键词：
SPIN; TRANSPORT; TEMPERATURE; NANOMAGNET; INSULATOR; METALS;
D O I：
10.1103/PhysRevB.92.224404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页数：8
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