Thickness-Dependent Spin Pumping in YIG/W$_{90}$Ti$_{10}$ Bilayers
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arXiv
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| Format: | Preprint |
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2025
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| author | Hachem, Marielle Harajli, Zeinab Isber, Samih Haidar, Mohammad |
| author_facet | Hachem, Marielle Harajli, Zeinab Isber, Samih Haidar, Mohammad |
| contents | We investigate the spin pumping efficiency in YIG/YIG/W$_{90}$Ti$_{10}$ bilayers by measuring the thickness dependence of both the YIG and WTi layers using broadband ferromagnetic resonance (FMR) spectroscopy. The deposition of a 5-nm WTi layer leads to enhanced Gilbert damping in thinner YIG films, indicating efficient spin current injection. From the spin pumping contribution to the damping of the YIG/WTi bilayer, we determine an effective spin mixing conductance of $ 3.3 \times 10^{18}~\mathrm{m}^{-2} $ for the 5-nm WTi layer. Further measurements with varying WTi thickness reveal a non-monotonic dependence of spin mixing conductance, peaking at $ 4.2 \times 10^{18}~\mathrm{m}^{-2} $ for a 3-nm WTi layer. This behavior is attributed to a structural phase transition from the high-spin--orbit $ β$-phase to the less efficient $ α$-phase in thicker WTi layers. Furthermore, comparative analysis with YIG/W bilayers shows that Ti doping significantly reduces $ g^{\uparrow\downarrow}_{\mathrm{eff}} $. These findings highlight the critical role of alloy composition and structural phase in tuning spin transport for spintronic applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_06831 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thickness-Dependent Spin Pumping in YIG/W$_{90}$Ti$_{10}$ Bilayers Hachem, Marielle Harajli, Zeinab Isber, Samih Haidar, Mohammad Materials Science Mesoscale and Nanoscale Physics Applied Physics We investigate the spin pumping efficiency in YIG/YIG/W$_{90}$Ti$_{10}$ bilayers by measuring the thickness dependence of both the YIG and WTi layers using broadband ferromagnetic resonance (FMR) spectroscopy. The deposition of a 5-nm WTi layer leads to enhanced Gilbert damping in thinner YIG films, indicating efficient spin current injection. From the spin pumping contribution to the damping of the YIG/WTi bilayer, we determine an effective spin mixing conductance of $ 3.3 \times 10^{18}~\mathrm{m}^{-2} $ for the 5-nm WTi layer. Further measurements with varying WTi thickness reveal a non-monotonic dependence of spin mixing conductance, peaking at $ 4.2 \times 10^{18}~\mathrm{m}^{-2} $ for a 3-nm WTi layer. This behavior is attributed to a structural phase transition from the high-spin--orbit $ β$-phase to the less efficient $ α$-phase in thicker WTi layers. Furthermore, comparative analysis with YIG/W bilayers shows that Ti doping significantly reduces $ g^{\uparrow\downarrow}_{\mathrm{eff}} $. These findings highlight the critical role of alloy composition and structural phase in tuning spin transport for spintronic applications. |
| title | Thickness-Dependent Spin Pumping in YIG/W$_{90}$Ti$_{10}$ Bilayers |
| topic | Materials Science Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2507.06831 |