تقرير
Spin current generation from an epitaxial tungsten dioxide WO$_{2}$
| العنوان: | Spin current generation from an epitaxial tungsten dioxide WO$_{2}$ |
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| المؤلفون: | Ueda, Kohei, Fujii, Hayato, Kida, Takanori, Hagiwara, Masayuki, Matsuno, Jobu |
| المصدر: | APL Mater. 11, 061125 (2023) |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | We report on efficient spin current generation at room temperature in rutile type WO$_{2}$ grown on Al$_{2}$O$_{3}$(0001) substrate. The optimal WO$_{2}$ film has (010)-oriented monoclinically distorted rutile structure with metallic conductivity due to 5$\it{d}$$^2$ electrons, as characterized by x-ray diffraction, electronic transport, and x-ray photoelectron spectroscopy. By conducting harmonic Hall measurement in Ni$_{81}$Fe$_{19}$/WO$_{2}$ bilayer, we estimate two symmetries of the spin-orbit torque (SOT), i.e., dampinglike (DL) and fieldlike ones to find that the former is larger than the latter. By comparison with the Ni$_{81}$Fe$_{19}$/W control sample, the observed DL SOT efficiency $\xi$$_{DL}$ of WO$_{2}$ (+0.174) is about two thirds of that of W (-0.281) in magnitude, with a striking difference in their signs. The magnitude of the $\xi$$_{DL}$ of WO$_{2}$ exhibits comparable value to those of widely reported Pt and Ta, and Ir oxide IrO$_{2}$. The positive sign of the $\xi$$_{DL}$ of WO$_{2}$ can be explained by the preceding theoretical study based on the 4$\it{d}$ oxides. These results highlight that the epitaxial WO$_{2}$ offers a great opportunity of rutile oxides with spintronic functionalities, leading to future spin-orbit torque-controlled devices. Comment: 14 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0153533 |
| URL الوصول: | http://arxiv.org/abs/2305.17887 |
| رقم الأكسشن: | edsarx.2305.17887 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0153533 |
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