High-efficiency Pt$_{75}$Au$_{25}$-based spintronic terahertz emitters
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918380436455424 |
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| author | Shi, Wenlu Nelson, Gene D. Wu, Han-Hsuan Ju, Yiwei Pan, Xiaoqing Ho, Wilson Krivorotov, Ilya N. |
| author_facet | Shi, Wenlu Nelson, Gene D. Wu, Han-Hsuan Ju, Yiwei Pan, Xiaoqing Ho, Wilson Krivorotov, Ilya N. |
| contents | Spintronic terahertz emitters (STEs) generate broadband THz radiation via ultrafast spin-charge conversion in magnetic multilayers, offering spectral coverage beyond that of photoconductive antennas and nonlinear optical crystals. Here, we demonstrate a new type of STE based on PtxAu100-x alloy that achieves significantly higher THz output power than widely used Pt-based devices. Alloy composition and layer thickness tuning yield Pt75Au25 as the optimal alloy providing a 30 % increase in THz power in CoFeB/Pt75Au25 bilayer STEs compared to the optimized CoFeB/Pt reference STE. In W/CoFeB/Pt$_{75}$Au$_{25}$ trilayer STEs, we observe a 10 % higher THz power than in the optimized W/CoFeB/Pt trilayer. The STE efficiency is reduced upon annealing for both Pt$_{75}$Au$_{25}$- and Pt-based STEs due to formation of interfacial alloys. Our results establish Pt$_{75}$Au$_{25}$ as a promising platform for high-performance STEs, where its giant spin Hall effect significantly enhances efficiency over conventional Pt-based devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25303 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-efficiency Pt$_{75}$Au$_{25}$-based spintronic terahertz emitters Shi, Wenlu Nelson, Gene D. Wu, Han-Hsuan Ju, Yiwei Pan, Xiaoqing Ho, Wilson Krivorotov, Ilya N. Materials Science Mesoscale and Nanoscale Physics Spintronic terahertz emitters (STEs) generate broadband THz radiation via ultrafast spin-charge conversion in magnetic multilayers, offering spectral coverage beyond that of photoconductive antennas and nonlinear optical crystals. Here, we demonstrate a new type of STE based on PtxAu100-x alloy that achieves significantly higher THz output power than widely used Pt-based devices. Alloy composition and layer thickness tuning yield Pt75Au25 as the optimal alloy providing a 30 % increase in THz power in CoFeB/Pt75Au25 bilayer STEs compared to the optimized CoFeB/Pt reference STE. In W/CoFeB/Pt$_{75}$Au$_{25}$ trilayer STEs, we observe a 10 % higher THz power than in the optimized W/CoFeB/Pt trilayer. The STE efficiency is reduced upon annealing for both Pt$_{75}$Au$_{25}$- and Pt-based STEs due to formation of interfacial alloys. Our results establish Pt$_{75}$Au$_{25}$ as a promising platform for high-performance STEs, where its giant spin Hall effect significantly enhances efficiency over conventional Pt-based devices. |
| title | High-efficiency Pt$_{75}$Au$_{25}$-based spintronic terahertz emitters |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.25303 |