Sub-millimeter propagation of antiferromagnetic magnons via magnon-photon coupling
Sub-millimeter propagation of antiferromagnetic magnons via magnon-photon coupling
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DOI：
10.1038/s44306-024-00034-3
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
R. Kainuma;Keita Matsumoto;T. Ito;T. Satoh
中科院分区：
文献类型：
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作者：
R. Kainuma;Keita Matsumoto;T. Ito;T. Satoh
磁振子的全光控制是实现磁振子无电流技术的重要基础研究和实际应用技术。磁振子极化激元是磁振子和光子在磁介质中的耦合态，具有磁振子般的可控性和光子般的高速传播特性。虽然最近的研究已经观察到磁振子极化激元作为入射太赫兹波的调制，磁振子光子耦合对磁振子传播特性的影响仍然没有探索。本研究的目的是通过时间分辨成像测量来观察相干磁振子-极化激元的时空动力学。由于磁振子和光子之间预期的强耦合，选择BiFeO 3作为样品。观察到的动力学表明，反铁磁振子可以通过与光子的强耦合进行长距离传播，最长可达数百微米。这些结果增强了我们对磁振子系统的光控制的理解，从而为太赫兹光磁振子学铺平了道路。
For the realization of magnon-based current-free technologies, referred to as magnonics, all-optical control of magnons is an important technique for both fundamental research and practical applications. Magnon-polariton is a coupled state of magnon and photon in a magnetic medium, expected to exhibit magnon-like controllability and photon-like high-speed propagation. While recent studies have observed magnon-polaritons as modulation of incident terahertz waves, the influence of magnon-photon coupling on magnon propagation properties remains unexplored. This study aimed to observe the spatiotemporal dynamics of coherent magnon-polaritons through time-resolved imaging measurements. BiFeO3was selected as the sample due to its anticipated strong coupling between magnons and photons. The observed dynamics suggest that antiferromagnetic magnons can propagate over long distances, up to hundreds of micrometers, through strong coupling with photons. These results enhance our understanding of the optical control of magnonic systems, thereby paving the way for terahertz opto-magnonics.