[10p-S302-1~18] 10.2 スピン基盤技術・萌芽的デバイス技術

▲ [10p-S302-2] Spin-to-charge conversion mechanism in TbCo/Pt/YIG due to spin Seebeck effect

〇(PC)Ahmet Yagmur¹、Satoshi Sumi¹、Hiroyuki Awano¹、Kenji Tanabe¹ (1.Toyota Technological Institute)

キーワード：spin Hall effect, spin Seebeck effect, ferrimagnets

In this study, we demonstrate the conventional inverse spin Hall effect (ISHE) and magnetization-dependent ISHE (MD-ISHE) in TbCo/Pt/Y₃Fe₅O₁₂ devices using the spin Seebeck effect [1,2]. It was found that a thermally injected spin current is converted into two charge currents: (1) dependent on the magnetization direction of TbCo (MD-ISHE) and (2) independent on the magnetization direction of TbCo (ISHE). Here, we investigate the effect of Pt and TbCo thicknesses on the ISHE and MD-ISHE. We found that the MD-ISHE is originated by the TbCo/Pt interface, whereas the conventional ISHE is dominated by the bulk Pt and TbCo. Meanwhile, the spin diffusion length of TbCo is estimated to be ~5.5 nm. Our findings demonstrate that perpendicularly magnetized TbCo supplies additional symmetry to the ISHE and provides advantages in terms of tailoring the spin-current polarization.
This work was partially supported by a Grant-in-Aid for Scientific Research(C) (Grant No. 20K05307) from JSPS and the Tokai Foundation of Technology.