Article Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface

Leonid A. Shelukhin (a Ioffe Institute, St. Petersburg, Russia) ; Anna V. Kuzikova (a Ioffe Institute, St. Petersburg, Russia) ; Andrey V. Teleginb (b M. N. Mikheev Institute of Metal Physics, Ural Branch of Russian Academy of Science) ; Vladimir D. Bessonov (b M. N. Mikheev Institute of Metal Physics, Ural Branch of Russian Academy of Science) ; Alexey V. Ognev (c Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Sakhalin State University) ; Alexander S. Samardak (c Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Sakhalin State University,) ; Junho Park (e Department of Materials Science and Engineering, Korea University) ; Young Keun Kim (e Department of Materials Science and Engineering, Korea University) ; Alexandra M. Kalashnikova (a Ioffe Institute, St. Petersburg, Russia)

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Leonid A. Shelukhin, Anna V. Kuzikova, Andrey V. Teleginb, Vladimir D. Bessonov, Alexey V. Ognev, Alexander S. Samardak, Junho Park, Young Keun Kim, Alexandra M. Kalashnikova. Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface. Science and Techonology of Advanced Materials. 2025, 26 (1), 2448417 . https://doi.org/10.48505/nims.5311

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(abstract)

The development of spintronic emitters of broadband terahertz (THz) pulses relies on designing heterostructures in which the processes of laser-driven spin current generation and subsequent spin-to-charge current conversion are the most efficient. The interface between the ferromagnetic and nonmagnetic layers in an emitter is a critical element. In this study, we experimentally examined single-cycle THz pulse generation from a laser-pulse-excited Pt/Co emitter with a 1.2-nm-thick composition-gradient interface between the Pt and Co and compared it with the emission from a conventional Pt/Co structure with an abrupt interface. We found that the gradient interface improved the efficiency of the optics-to-THz conversion by a factor of two in a wide range of optical fluences up to 3 mJ⋅cm−2. This enhancement was caused by a pronounced increase in the transmittance of the laser-driven spin-polarized current through the gradient interface compared with the abrupt interface. Moreover, it was evident that such transmission deteriorated with the laser fluence owing to the spin accumulation effect.

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Keyword: spintronic emitte, single-cycle terahertz pulse, inverse spin Hall effect, Pt/Co interface

Date published: 2025-12-31

Publisher: Taylor & Francis

Journal:

  • Science and Techonology of Advanced Materials (ISSN: 14686996) vol. 26 issue. 1 2448417

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5311

First published URL: https://doi.org/10.1080/14686996.2024.2448417

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Updated at: 2025-02-06 16:30:15 +0900

Published on MDR: 2025-02-06 16:30:15 +0900

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