Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface
Magnetization switching using spin–orbit torque offers a promising route to developing non-volatile memory technologies. The prerequisite, however, is the charge-to-spin current conversion, which has been achieved traditionally by harnessing the spin–orbit interaction in heavy metals, topological in...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2023-04-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0142695 |
| _version_ | 1797771862748430336 |
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| author | Saikat Das Satoshi Sugimoto Varun Kumar Kushwaha Yusuke Kozuka Shinya Kasai |
| author_facet | Saikat Das Satoshi Sugimoto Varun Kumar Kushwaha Yusuke Kozuka Shinya Kasai |
| author_sort | Saikat Das |
| collection | DOAJ |
| description | Magnetization switching using spin–orbit torque offers a promising route to developing non-volatile memory technologies. The prerequisite, however, is the charge-to-spin current conversion, which has been achieved traditionally by harnessing the spin–orbit interaction in heavy metals, topological insulators, and heterointerfaces hosting a high-mobility two-dimensional electron gas. Here, we report the observation of charge-to-spin current conversion at the interface between ferromagnetic Ni0.8Fe0.2 and ferroelectric Bi2WO6 thin films. The resulting spin–orbit torque consists of damping-like and field-like components, and the estimated efficiency amounts to about 0.48 ± 0.02, which translates to 0.96 ± 0.04 nm−1 in terms of interfacial efficiency. These numbers are comparable to contemporary spintronic materials exhibiting giant spin–orbit torque efficiency. We suggest that the Rashba Edelstein effect underpins the charge-to-spin current conversion on the interface side of Ni0.8Fe0.2. Further, we provide an intuitive explanation for the giant efficiency in terms of the spin-orbit proximity effect, which is enabled by orbital hybridization between W and Ni (Fe) atoms across the interface. Our work highlights that Aurivillius compounds are a potential addition to the emerging transition metal oxide-based spin–orbit materials. |
| first_indexed | 2024-03-12T21:43:40Z |
| format | Article |
| id | doaj.art-caef49fbdf334487b9679442eb1ce8c2 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-03-12T21:43:40Z |
| publishDate | 2023-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-caef49fbdf334487b9679442eb1ce8c22023-07-26T14:42:04ZengAIP Publishing LLCAPL Materials2166-532X2023-04-01114041113041113-710.1063/5.0142695Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interfaceSaikat Das0Satoshi Sugimoto1Varun Kumar Kushwaha2Yusuke Kozuka3Shinya Kasai4National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, JapanNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, JapanMagnetization switching using spin–orbit torque offers a promising route to developing non-volatile memory technologies. The prerequisite, however, is the charge-to-spin current conversion, which has been achieved traditionally by harnessing the spin–orbit interaction in heavy metals, topological insulators, and heterointerfaces hosting a high-mobility two-dimensional electron gas. Here, we report the observation of charge-to-spin current conversion at the interface between ferromagnetic Ni0.8Fe0.2 and ferroelectric Bi2WO6 thin films. The resulting spin–orbit torque consists of damping-like and field-like components, and the estimated efficiency amounts to about 0.48 ± 0.02, which translates to 0.96 ± 0.04 nm−1 in terms of interfacial efficiency. These numbers are comparable to contemporary spintronic materials exhibiting giant spin–orbit torque efficiency. We suggest that the Rashba Edelstein effect underpins the charge-to-spin current conversion on the interface side of Ni0.8Fe0.2. Further, we provide an intuitive explanation for the giant efficiency in terms of the spin-orbit proximity effect, which is enabled by orbital hybridization between W and Ni (Fe) atoms across the interface. Our work highlights that Aurivillius compounds are a potential addition to the emerging transition metal oxide-based spin–orbit materials.http://dx.doi.org/10.1063/5.0142695 |
| spellingShingle | Saikat Das Satoshi Sugimoto Varun Kumar Kushwaha Yusuke Kozuka Shinya Kasai Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface APL Materials |
| title | Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface |
| title_full | Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface |
| title_fullStr | Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface |
| title_full_unstemmed | Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface |
| title_short | Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface |
| title_sort | observation of charge to spin conversion with giant efficiency at ni0 8fe0 2 bi2wo6 interface |
| url | http://dx.doi.org/10.1063/5.0142695 |
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