A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3
Understanding the mechanisms of spin-charge interconversion is a major challenge in modern spintronics. In this study, we investigate the complex charge-to-spin conversion (CSC) and spin-to-charge conversion (SCC) using the modulated Dirac surface state of Bi2Se3 thin films. The role of Bi2Se3, whic...
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Elsevier
2025-01-01
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| Series: | Applied Surface Science Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666523925000029 |
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| author | Youngmin Lee Jonghoon Kim Seungwon Rho Seok-Bo Hong Hyeongmun Kim Jaehan Park Dajung Kim Chul Kang Myung-Ho Bae Mann-Ho Cho |
| author_facet | Youngmin Lee Jonghoon Kim Seungwon Rho Seok-Bo Hong Hyeongmun Kim Jaehan Park Dajung Kim Chul Kang Myung-Ho Bae Mann-Ho Cho |
| author_sort | Youngmin Lee |
| collection | DOAJ |
| description | Understanding the mechanisms of spin-charge interconversion is a major challenge in modern spintronics. In this study, we investigate the complex charge-to-spin conversion (CSC) and spin-to-charge conversion (SCC) using the modulated Dirac surface state of Bi2Se3 thin films. The role of Bi2Se3, which possesses a spin-momentum locked Dirac surface state (DSS), in the CSC and SCC processes is explored using spin-torque ferromagnetic resonance (ST-FMR) and terahertz emission methods, respectively. Distinct differences in spin Hall angles are observed in ultrathin Bi2Se3 films on HfO2-x, compared to those on a typical substrate, indicating the dependence on the spin-orbit interaction. Specifically, the interaction of d-orbital of the unbound hafnium in HfO2-x and Bi2Se3 enhances the spin-orbit interaction. In addition, we found that the complex interaction between the surface and bulk states affects the spin diffusion length and the spin current injection region. The influence of the surface state on the conversion processes decreases as the Bi2Se3 film thickness increases, resulting in differing efficiency for SCC and CSC due to the asymmetrical stack structure. The findings using Bi2Se3 ultrathin films enhance our understanding of DSS-related CSC and SCC mechanisms, paving the way for performance optimization of future spintronic devices. |
| format | Article |
| id | doaj-art-3eb3bdffa9334798aee5cb0b52aee6b1 |
| institution | Kabale University |
| issn | 2666-5239 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applied Surface Science Advances |
| spelling | doaj-art-3eb3bdffa9334798aee5cb0b52aee6b12025-01-29T05:02:12ZengElsevierApplied Surface Science Advances2666-52392025-01-0125100693A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3Youngmin Lee0Jonghoon Kim1Seungwon Rho2Seok-Bo Hong3Hyeongmun Kim4Jaehan Park5Dajung Kim6Chul Kang7Myung-Ho Bae8Mann-Ho Cho9Graduate program of semiconductor science and engineering, Yonsei University, Seoul, 03722, South Korea; Korea Research Institute of Standards and Science, Daejeon 34113, South KoreaDepartment of Physics, Yonsei University, Seoul, 03722, South KoreaDepartment of Physics, Yonsei University, Seoul, 03722, South KoreaDepartment of Physics, Yonsei University, Seoul, 03722, South KoreaAdvanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South KoreaDepartment of Physics, Yonsei University, Seoul, 03722, South KoreaDepartment of Physics, Yonsei University, Seoul, 03722, South KoreaAdvanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea; Corresponding authors.Graduate program of semiconductor science and engineering, Yonsei University, Seoul, 03722, South Korea; Korea Research Institute of Standards and Science, Daejeon 34113, South Korea; Corresponding authors.Graduate program of semiconductor science and engineering, Yonsei University, Seoul, 03722, South Korea; Department of Physics, Yonsei University, Seoul, 03722, South Korea; Department of System Semiconductor Engineering, Yonsei University, Seoul 03722, South Korea; Corresponding authors.Understanding the mechanisms of spin-charge interconversion is a major challenge in modern spintronics. In this study, we investigate the complex charge-to-spin conversion (CSC) and spin-to-charge conversion (SCC) using the modulated Dirac surface state of Bi2Se3 thin films. The role of Bi2Se3, which possesses a spin-momentum locked Dirac surface state (DSS), in the CSC and SCC processes is explored using spin-torque ferromagnetic resonance (ST-FMR) and terahertz emission methods, respectively. Distinct differences in spin Hall angles are observed in ultrathin Bi2Se3 films on HfO2-x, compared to those on a typical substrate, indicating the dependence on the spin-orbit interaction. Specifically, the interaction of d-orbital of the unbound hafnium in HfO2-x and Bi2Se3 enhances the spin-orbit interaction. In addition, we found that the complex interaction between the surface and bulk states affects the spin diffusion length and the spin current injection region. The influence of the surface state on the conversion processes decreases as the Bi2Se3 film thickness increases, resulting in differing efficiency for SCC and CSC due to the asymmetrical stack structure. The findings using Bi2Se3 ultrathin films enhance our understanding of DSS-related CSC and SCC mechanisms, paving the way for performance optimization of future spintronic devices.http://www.sciencedirect.com/science/article/pii/S2666523925000029Spin-to-charge conversionCharge-to-spin conversionSurface stateSpin hall angleSpintronics |
| spellingShingle | Youngmin Lee Jonghoon Kim Seungwon Rho Seok-Bo Hong Hyeongmun Kim Jaehan Park Dajung Kim Chul Kang Myung-Ho Bae Mann-Ho Cho A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 Applied Surface Science Advances Spin-to-charge conversion Charge-to-spin conversion Surface state Spin hall angle Spintronics |
| title | A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 |
| title_full | A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 |
| title_fullStr | A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 |
| title_full_unstemmed | A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 |
| title_short | A comparative study on spin-to-charge and charge-to-spin conversion using modulated Dirac surface states of Bi2Se3 |
| title_sort | comparative study on spin to charge and charge to spin conversion using modulated dirac surface states of bi2se3 |
| topic | Spin-to-charge conversion Charge-to-spin conversion Surface state Spin hall angle Spintronics |
| url | http://www.sciencedirect.com/science/article/pii/S2666523925000029 |
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