Orbital relaxation length from first-principles scattering calculations
| Autor: | Rang, Max, Kelly, Paul J. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Physical Review B 109, 214427 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.109.214427 |
| Popis: | The orbital Hall effect generates a current of orbital angular momentum perpendicular to a charge current. Experiments suggest that this orbital current decays on a long length scale that is of the order of the spin flip diffusion length or longer. We examine this suggestion using first-principles quantum mechanical scattering calculations to study the decay of orbital currents injected from an orbitally-polarized lead into thermally disordered bulk systems of selected transition metals. We find that the decay occurs over only a few atomic layers. On this length scale the orbital current may be converted into a spin current if the spin Hall angle is sufficiently large, as for Pt. In Cu, Cr and V with small spin Hall angles, the conversion into a spin current is negligible in the bulk and significant conversion only occurs at interfaces. Comment: 6 pages, 6 figures |
| Databáze: | arXiv |
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