Increasing the Efficiency of a Spintronic THz Emitter Based on WSe<sub>2</sub>/FeCo

We report an increase in terahertz (THz) radiation efficiency due to FeCo/WSe<sub>2</sub> structures in the reflection geometry. This can be attributed to an absorption increase in the alloy FeCo layer at the input FeCo/WSe<sub>2</sub> interface due to constructive interferen...

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Auteurs principaux: Dinar Khusyainov, Andrey Guskov, Sergei Ovcharenko, Nicolas Tiercelin, Vladimir Preobrazhensky, Arseniy Buryakov, Alexander Sigov, Elena Mishina
Format: article
Langue:EN
Publié: MDPI AG 2021
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Accès en ligne:https://doaj.org/article/f8553f7939da4514b74332fa7ebcf88b
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Résumé:We report an increase in terahertz (THz) radiation efficiency due to FeCo/WSe<sub>2</sub> structures in the reflection geometry. This can be attributed to an absorption increase in the alloy FeCo layer at the input FeCo/WSe<sub>2</sub> interface due to constructive interference, as well as to the backward transport of hot carriers from FeCo to WSe<sub>2</sub>. In contrast to the transmission geometry, the THz generation efficiency in the reflection is much less dependent on the magnetic layer thickness. Our results suggest a cheap and efficient way to improve the characteristics of THz spintronic emitters with the conservation of a full set of their important properties.