Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface
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 nonmagne...
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Taylor & Francis Group
2025-12-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2024.2448417 |
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| author | Leonid A. Shelukhin Anna V. Kuzikova Andrey V. Telegin Vladimir D. Bessonov Alexey V. Ognev Alexander S. Samardak Junho Park Young Keun Kim Alexandra M. Kalashnikova |
| author_facet | Leonid A. Shelukhin Anna V. Kuzikova Andrey V. Telegin Vladimir D. Bessonov Alexey V. Ognev Alexander S. Samardak Junho Park Young Keun Kim Alexandra M. Kalashnikova |
| author_sort | Leonid A. Shelukhin |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-e878dfa442134e4c9e6e98ce6dc40958 |
| institution | Kabale University |
| issn | 1468-6996 1878-5514 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj-art-e878dfa442134e4c9e6e98ce6dc409582025-02-04T11:40:41ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142025-12-0126110.1080/14686996.2024.2448417Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interfaceLeonid A. Shelukhin0Anna V. Kuzikova1Andrey V. Telegin2Vladimir D. Bessonov3Alexey V. Ognev4Alexander S. Samardak5Junho Park6Young Keun Kim7Alexandra M. Kalashnikova8Ioffe Institute, St. Petersburg, RussiaIoffe Institute, St. Petersburg, RussiaM. N. Mikheev Institute of Metal Physics, Ural Branch of Russian Academy of Science, Yekaterinburg, RussiaM. N. Mikheev Institute of Metal Physics, Ural Branch of Russian Academy of Science, Yekaterinburg, RussiaInstitute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, RussiaInstitute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, RussiaDepartment of Materials Science and Engineering, Korea University, Seoul, Republic of KoreaDepartment of Materials Science and Engineering, Korea University, Seoul, Republic of KoreaIoffe Institute, St. Petersburg, RussiaThe 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.https://www.tandfonline.com/doi/10.1080/14686996.2024.2448417Spintronic emittersingle-cycle terahertz pulseinverse spin hall effectPt/Co interface |
| spellingShingle | Leonid A. Shelukhin Anna V. Kuzikova Andrey V. Telegin 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 Technology of Advanced Materials Spintronic emitter single-cycle terahertz pulse inverse spin hall effect Pt/Co interface |
| title | Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| title_full | Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| title_fullStr | Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| title_full_unstemmed | Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| title_short | Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| title_sort | enhanced laser induced single cycle terahertz generation in a spintronic emitter with a gradient interface |
| topic | Spintronic emitter single-cycle terahertz pulse inverse spin hall effect Pt/Co interface |
| url | https://www.tandfonline.com/doi/10.1080/14686996.2024.2448417 |
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