Magnonic activity of ferromagnetic nanocylinders

被引：7
|
作者：
Yang, Mingming [1 ,2 ]
Yin, Binghui [1 ,2 ]
Li, Zhisheng [1 ,2 ]
Zeng, Xiaoyan [3 ]
Yan, Ming [1 ,2 ]
机构：
[1] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China
[2] Shanghai Key Lab High Temp Superconductors, Shanghai 200444, Peoples R China
[3] Shanghai Univ, Dept Math, Shanghai 200444, Peoples R China
来源：
PHYSICAL REVIEW B | 2021年 / 103卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Optical materials;
D O I：
10.1103/PhysRevB.103.094404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The optical activity refers to the rotation of the vibration plane of linearly polarized light traversing certain substances. Here we report an analogous phenomenon for spin waves (SWs) in cylindrical nanowires, whose azimuthal distribution undergoes a continuous rotation as traveling along the wire. This effect, in line with the Fresnel model of the optical activity, is attributed to different propagating speeds of two circular states (left and right handed) composing the SW modes. The SW circular birefringence observed here originates from the overall curvilinear shape of the waveguide. Moreover, the fact that an external field is able to alter the rotatory power of the nanowires is reminiscent of the Faraday magneto-optical effect.
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页数：5
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