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arXiv · 2110.08147

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Kenta Kato·Tomohiro Yokoyama·Hajime Ishihara
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Abstract

Magnon-polaritons (MPs) refer to a light--magnon coupled state and can potentially act as information carriers, possibly enabling charge-free computation. However, the light--magnon coupling is inherently weak. To achieve sufficiently strong coupling, a large ferromagnet or coupling with a microwave cavity is necessary. Herein, we theoretically propose a fundamental platform for magnonic and magnon--optical information storage devices and discuss the transport properties of MP's. The proposed multi-layered structure overcomes the aforementioned issues. Owing to the waveguide modes, magnons placed in a nanometer-thin layer are strongly coupled with light, exhibiting rich functionalities of thick-layer MPs via the `magnetic antenna effect'. Thus, the thin-layer MPs are faster, and the direction is switchable. The results of this study will enable the integration of ferromagnetic micro and nanostructures for MP-based information devices without any restrictions due to cavities.

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Kenta Kato, Tomohiro Yokoyama, Hajime Ishihara. 2021-10-15. Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect. https://doi.org/10.1103/physrevapplied.19.034035

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