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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.20617 |
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| _version_ | 1866917972709212160 |
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| author | Chen, Yue Chen, Haoran Shen, Xi Chen, Weizhao Liu, Yi Wu, Yizheng Yuan, Zhe |
| author_facet | Chen, Yue Chen, Haoran Shen, Xi Chen, Weizhao Liu, Yi Wu, Yizheng Yuan, Zhe |
| contents | Using first-principles electronic structure calculation, we demonstrate the spin dissipation process in bulk Fe by orbital excitations within the energy bands of pure spin character. The variation of orbitals in the intraband transitions provides an efficient channel to convert spin to orbital angular momentum with spin-orbit interaction. This mechanism dominates the Gilbert damping of Fe below room temperature. The theoretical prediction is confirmed by the ferromagnetic resonance experiment performed on single-crystal Fe(001) films. A significant thickness-dependent damping oscillation is found at low temperature induced by the quantum well states of the corresponding energy bands. Our findings not only explain the microscopic nature of the recently reported ultralow damping of Fe-based alloys, but also help for the understanding of the transport and dissipation process of orbital currents. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_20617 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Orbital-excitation-dominated magnetization dissipation and quantum oscillation of Gilbert damping in Fe films Chen, Yue Chen, Haoran Shen, Xi Chen, Weizhao Liu, Yi Wu, Yizheng Yuan, Zhe Mesoscale and Nanoscale Physics Materials Science Using first-principles electronic structure calculation, we demonstrate the spin dissipation process in bulk Fe by orbital excitations within the energy bands of pure spin character. The variation of orbitals in the intraband transitions provides an efficient channel to convert spin to orbital angular momentum with spin-orbit interaction. This mechanism dominates the Gilbert damping of Fe below room temperature. The theoretical prediction is confirmed by the ferromagnetic resonance experiment performed on single-crystal Fe(001) films. A significant thickness-dependent damping oscillation is found at low temperature induced by the quantum well states of the corresponding energy bands. Our findings not only explain the microscopic nature of the recently reported ultralow damping of Fe-based alloys, but also help for the understanding of the transport and dissipation process of orbital currents. |
| title | Orbital-excitation-dominated magnetization dissipation and quantum oscillation of Gilbert damping in Fe films |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2502.20617 |