Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi$_x$Se$_{1-x}$
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arXiv
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| Format: | Preprint |
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2022
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| author | Arango, Isabel C Anadón, Alberto Novoa, Silvestre Pham, Van Tuong Choi, Won Young Alegre, Junior Badie, Laurent Chuvilin, Andrey Petit-Watelot, Sébastien Hueso, Luis E Casanova, Fèlix Rojas-Sánchez, Juan-Carlos |
| author_facet | Arango, Isabel C Anadón, Alberto Novoa, Silvestre Pham, Van Tuong Choi, Won Young Alegre, Junior Badie, Laurent Chuvilin, Andrey Petit-Watelot, Sébastien Hueso, Luis E Casanova, Fèlix Rojas-Sánchez, Juan-Carlos |
| contents | Topological materials are of high interest due to the promise to obtain low power and fast memory devices based on efficient spin-orbit torque switching or spin-orbit magnetic state read-out. In particular, sputtered polycrystalline Bi$_x$Se$_{1-x}$ is one of the materials with more potential for this purpose since it is relatively easy to fabricate and has been reported to have a very high spin Hall angle. We study the spin-to-charge conversion in Bi$_x$Se$_{1-x}$ using the spin pumping technique coming from the ferromagnetic resonance in a contiguous permalloy thin film. We put a special emphasis on the interfacial properties of the system. Our results show that the spin Hall angle of Bi$_x$Se$_{1-x}$ has an opposite sign to the one of Pt. The charge current arising from the spin-to-charge conversion is, in contrast, lower than Pt by more than one order of magnitude. We ascribe this to the interdiffusion of Bi$_x$Se$_{1-x}$ and permalloy and the changes in chemical composition produced by this effect, which is an intrinsic characteristic of the system and is not considered in many other studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_12697 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi$_x$Se$_{1-x}$ Arango, Isabel C Anadón, Alberto Novoa, Silvestre Pham, Van Tuong Choi, Won Young Alegre, Junior Badie, Laurent Chuvilin, Andrey Petit-Watelot, Sébastien Hueso, Luis E Casanova, Fèlix Rojas-Sánchez, Juan-Carlos Materials Science Mesoscale and Nanoscale Physics Topological materials are of high interest due to the promise to obtain low power and fast memory devices based on efficient spin-orbit torque switching or spin-orbit magnetic state read-out. In particular, sputtered polycrystalline Bi$_x$Se$_{1-x}$ is one of the materials with more potential for this purpose since it is relatively easy to fabricate and has been reported to have a very high spin Hall angle. We study the spin-to-charge conversion in Bi$_x$Se$_{1-x}$ using the spin pumping technique coming from the ferromagnetic resonance in a contiguous permalloy thin film. We put a special emphasis on the interfacial properties of the system. Our results show that the spin Hall angle of Bi$_x$Se$_{1-x}$ has an opposite sign to the one of Pt. The charge current arising from the spin-to-charge conversion is, in contrast, lower than Pt by more than one order of magnitude. We ascribe this to the interdiffusion of Bi$_x$Se$_{1-x}$ and permalloy and the changes in chemical composition produced by this effect, which is an intrinsic characteristic of the system and is not considered in many other studies. |
| title | Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi$_x$Se$_{1-x}$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2212.12697 |