报告题目：Spin Seebeck effect and Magnon Drag Effect in YIG/Metallic Hybrid Structures
报 告 人：万蔡华 副研究员（中国科学院物理研究所）
报告时间：2017年11 月 29日（周三）10:00
报告地点：校本部G105
邀请人：金钻明
报告摘要：
Spin caloritronics, aiming to reuse exponentially growing waste energy in current nanoelectronics, has gradually evolved as a main branch of spintronics. Among different thermo- and magneto-transport phenomena, spin Seebeck effect (SSE) in ferromagnetic insulators are most attractive because of their capabilities to harvest pure spin current via thermal gradient. In this talk, we will first ambiguously show that SSE can not only be observed in heavy metals YIG/Cu/Pt but also in normal ferromagnetic metals such as YIG/Interlayer/Permalloy systems [1]. The spin Hall angle of permalloy obtained from this experiment is nearly comparable to that of Pt, which indicates application potentials of permalloy in spin-orbitronics. Second we will also demonstrate a clear evidence of magnon-drag effect in Pt/YIG/Pt system besides of the SSE [2]. Our experimental results show that this effect could also be used as a powerful tool to transfer "angular momentum" information over long distances even in polycrystalline YIG system. Above all, YIG, a typical ferrimagnetic insulator has been demonstrated as both excellent spin current resource and transport channel for the coming spin caloritronic or even magnonic applications.
[1] H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T .Zhang, Z. C. Wen and X.F. Han, Phys. Rev. B, 92, 054404 (2015).
[2] H. Wu, C. H. Wan, X. Zhang, Z. H. Yuan, Q. T. Zhang, J. Y. Qin, H. X. Wei, X. F. Han, and S. Zhang, Phys. Rev. B, 93, 060403(R) (2016).
