Sub-millimeter propagation of antiferromagnetic magnons via magnon-photon coupling

npj Spintronics Pub Date : 2024-07-02 DOI:10.1038/s44306-024-00034-3

Ryo Kainuma, Keita Matsumoto, Toshimitsu Ito, Takuya Satoh

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Abstract

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. BiFeO3 was 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.

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通过磁子-光子耦合实现反铁磁磁子的亚毫米级传播

为了实现基于磁子的无电流技术（简称磁子学），磁子的全光控制是基础研究和实际应用的一项重要技术。磁子-极化子是磁介质中磁子和光子的耦合态，有望表现出类似磁子的可控性和类似光子的高速传播性。虽然最近的研究已经观察到磁子-极化子对入射太赫兹波的调制作用，但磁子-光子耦合对磁子传播特性的影响仍有待探索。本研究旨在通过时间分辨成像测量来观察相干磁子-极化子的时空动态。之所以选择 BiFeO3 作为样品，是因为预计磁子与光子之间会产生强耦合。观察到的动态表明，反铁磁性磁子可以通过与光子的强耦合进行长距离传播，最远可达数百微米。这些结果加深了我们对磁子系统光学控制的理解，从而为太赫兹光磁学铺平了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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npj Spintronics

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