| Title: |
Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface |
| Authors: |
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 |
| Source: |
Science and Technology of Advanced Materials, Vol 26, Iss 1 (2025) |
| Publisher Information: |
Taylor & Francis Group |
| Publication Year: |
2025 |
| Collection: |
Directory of Open Access Journals: DOAJ Articles |
| Subject Terms: |
Spintronic emitter; single-cycle terahertz pulse; inverse spin hall effect; Pt/Co interface; Materials of engineering and construction. Mechanics of materials; TA401-492; Biotechnology; TP248.13-248.65 |
| 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://doaj.org/toc/1468-6996; https://doaj.org/toc/1878-5514; https://doaj.org/article/e878dfa442134e4c9e6e98ce6dc40958 |
| DOI: |
10.1080/14686996.2024.2448417 |
| Availability: |
https://doi.org/10.1080/14686996.2024.2448417; https://doaj.org/article/e878dfa442134e4c9e6e98ce6dc40958 |
| Accession Number: |
edsbas.E7FFF1FD |
| Database: |
BASE |