تقرير
Observation of charge-to-spin conversion with giant efficiency at Ni$_{0.8}$Fe$_{0.2}$/Bi$_{2}$WO$_{6}$ interface
| العنوان: | Observation of charge-to-spin conversion with giant efficiency at Ni$_{0.8}$Fe$_{0.2}$/Bi$_{2}$WO$_{6}$ interface |
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| المؤلفون: | Das, Saikat, Sugimoto, Satoshi, Kushwaha, Varun Kumar, Kozuka, Yusuke, Kasai, Shinya |
| المصدر: | APL Materials 11, 041113 (2023) |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | 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 Ni$_{0.8}$Fe$_{0.2}$ and ferroelectric Bi$_{2}$WO$_{6}$ thin films. The resulting spin-orbit torque consists of damping-like and field-like components, and the estimated efficiency amounts to about 0.48 $\pm$ 0.02, which translates to 0.96 $\pm$ 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 Ni$_{0.8}$Fe$_{0.2}$. 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. Comment: 20 pages |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0142695 |
| URL الوصول: | http://arxiv.org/abs/2304.02751 |
| رقم الأكسشن: | edsarx.2304.02751 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0142695 |
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