Emergent spin Hall conductivity in Tantalum-Rhenium alloys
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866918012778446848 |
|---|---|
| author | Janus, Felix Yadav, Jyoti Beermann, Nicolas Zhang, Wentao Hafez, Hassan A. Turchinovich, Dmitry Preu, Sascha Meinert, Markus |
| author_facet | Janus, Felix Yadav, Jyoti Beermann, Nicolas Zhang, Wentao Hafez, Hassan A. Turchinovich, Dmitry Preu, Sascha Meinert, Markus |
| contents | We investigate the spin Hall conductivity (SHC) of a composition series of a Ta-Re bcc solid solution. At approximately 60 at.% Ta the Ta-Re alloy features an SHC similar to bcc-W, while both endpoints of the compositional series have rather moderate SHC. The intermediate stoichiometries exhibit a substantial enhancement due to Fermi level tuning through the same band structure feature which gives bcc-W and $β$-W its large SHC. We provide experimental evidence for the enhancement of the SHC in the alloy via THz emission upon ultrafast laser excitation of Ta-Re/CoFeB bilayers. We demonstrate that a rigid band model derived from bcc-W and Fermi level tuning describes the experimental data with a similar accuracy as coherent potential approximation alloy calculations of the SHC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13577 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent spin Hall conductivity in Tantalum-Rhenium alloys Janus, Felix Yadav, Jyoti Beermann, Nicolas Zhang, Wentao Hafez, Hassan A. Turchinovich, Dmitry Preu, Sascha Meinert, Markus Materials Science We investigate the spin Hall conductivity (SHC) of a composition series of a Ta-Re bcc solid solution. At approximately 60 at.% Ta the Ta-Re alloy features an SHC similar to bcc-W, while both endpoints of the compositional series have rather moderate SHC. The intermediate stoichiometries exhibit a substantial enhancement due to Fermi level tuning through the same band structure feature which gives bcc-W and $β$-W its large SHC. We provide experimental evidence for the enhancement of the SHC in the alloy via THz emission upon ultrafast laser excitation of Ta-Re/CoFeB bilayers. We demonstrate that a rigid band model derived from bcc-W and Fermi level tuning describes the experimental data with a similar accuracy as coherent potential approximation alloy calculations of the SHC. |
| title | Emergent spin Hall conductivity in Tantalum-Rhenium alloys |
| topic | Materials Science |
| url | https://arxiv.org/abs/2501.13577 |