講演情報
[10p-PA3-26]Observation of Spin Seebeck Effect in YIG/[Pt/Cu]n
〇Tomoya Ikuno1, Shuto Sahara1, Yuichiro Kurokawa1, Hiromi Yuasa1 (1.Kyushu Univ.)
キーワード：
Spin Seebeck Effect
To improve Spin Seebeck Effect (SSE) thermoelectric generation, enhancing spin-to-charge conversion in heavy metals is indispensable. Previous study showed that Pt-Cu alloy single layers enhance output voltage. Laminated systems like Pt/Ru show lamination number n dependent conversion due to scattering mechanisms. In this study, we systematically investigated the relationship between V_SSE and n in YIG/[Pt/Cu]_n multilayers. We fabricated three overlayers (total 4.5 nm) on 50-nm-thick YIG/Pt_50Cu_50 alloy single layer (Sample A), and [Pt/Cu]_n[Pt] multilayers with n = 7 (Sample B) and n = 4 (Sample C). Evaluated ΔV/ΔT systematically increased: 1.27 μV/K (Sample A), 1.52 μV/K (Sample B), and 2.06 μV/K (Sample C). This trend shows ΔV/ΔT increases in multilayers by decreasing n, representing the opposite tendency to Pt/Ru multilayers. Optimizing multilayer structures is highly effective for maximizing efficiency.