Self-induced spin pumping and inverse spin Hall effect in single FePt thin films
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916605258104832 |
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| author | Ampuero, J. L. Anadón, A. Damas, H. Ghanbaja, J. Petit-Watelot, S. Rojas-Sánchez, J. -C. Rodriguez, D. Velázquez Gómez, J. E. Butera, A. Avilés-Félix, L. |
| author_facet | Ampuero, J. L. Anadón, A. Damas, H. Ghanbaja, J. Petit-Watelot, S. Rojas-Sánchez, J. -C. Rodriguez, D. Velázquez Gómez, J. E. Butera, A. Avilés-Félix, L. |
| contents | In this study, we investigate the spin-charge current conversion characteristics of chemically disordered ferromagnetic single FePt thin films by spin-pumping ferromagnetic resonance experiments performed on both a resonance cavity and on patterned devices. We clearly observe a self-induced signal in a single FePt layer. The sign of a single FePt spin pumping voltage signal is consistent with a typical bilayer with a positive spin Hall angle layer such as that of Pt on top of a ferromagnet (FM), substrate//FM/Pt. Structural analysis shows a strong composition gradient due to natural oxidation at both FePt interfaces, with the Si substrate and with the air. The FePt-thickness dependence of the self-induced charge current produced allowed us to obtain $λ_ \text{FePt}=(1.5\pm 0.1)$ nm and self-induced $θ_ \text{self-FePt}=0.047 \pm 0.003$, with efficiency for reciprocal effects applications $θ_ \text{self-FePt} \times λ_ \text{FePt} = 0.071$ nm which is comparable to that of Pt, $θ_ \text{SH-Pt} \times λ_ \text{Pt} = 0.2$ nm. Moreover, by studying bilayer systems such as Si//FePt/Pt and Si//Pt//FePt we independently could extract the individual contributions of the external inverse spin Hall effect of Pt and the self-induced inverse spin Hall effect of FePt. Notably, this method gives consistent values of charge currents produced due to only self-induced inverse spin Hall effect in FePt layers. These results advance our understanding of spin-to-charge interconversion mechanisms in composite thin films and pave the way for the development of next-generation spintronics devices based on self-torque. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11948 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Self-induced spin pumping and inverse spin Hall effect in single FePt thin films Ampuero, J. L. Anadón, A. Damas, H. Ghanbaja, J. Petit-Watelot, S. Rojas-Sánchez, J. -C. Rodriguez, D. Velázquez Gómez, J. E. Butera, A. Avilés-Félix, L. Materials Science In this study, we investigate the spin-charge current conversion characteristics of chemically disordered ferromagnetic single FePt thin films by spin-pumping ferromagnetic resonance experiments performed on both a resonance cavity and on patterned devices. We clearly observe a self-induced signal in a single FePt layer. The sign of a single FePt spin pumping voltage signal is consistent with a typical bilayer with a positive spin Hall angle layer such as that of Pt on top of a ferromagnet (FM), substrate//FM/Pt. Structural analysis shows a strong composition gradient due to natural oxidation at both FePt interfaces, with the Si substrate and with the air. The FePt-thickness dependence of the self-induced charge current produced allowed us to obtain $λ_ \text{FePt}=(1.5\pm 0.1)$ nm and self-induced $θ_ \text{self-FePt}=0.047 \pm 0.003$, with efficiency for reciprocal effects applications $θ_ \text{self-FePt} \times λ_ \text{FePt} = 0.071$ nm which is comparable to that of Pt, $θ_ \text{SH-Pt} \times λ_ \text{Pt} = 0.2$ nm. Moreover, by studying bilayer systems such as Si//FePt/Pt and Si//Pt//FePt we independently could extract the individual contributions of the external inverse spin Hall effect of Pt and the self-induced inverse spin Hall effect of FePt. Notably, this method gives consistent values of charge currents produced due to only self-induced inverse spin Hall effect in FePt layers. These results advance our understanding of spin-to-charge interconversion mechanisms in composite thin films and pave the way for the development of next-generation spintronics devices based on self-torque. |
| title | Self-induced spin pumping and inverse spin Hall effect in single FePt thin films |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.11948 |