报告题目（Title）：Magnonic spin-to-charge current conversion
报 告 人（Speaker）：Ssu-Yen Huang黄斯衍（台湾大学）
报告时间（Time）：2019年7月2日（周二）10:00
报告地点（Place）：校本部G309
邀请人（inviter）：金钻明
报告摘要（Abstract）：
The generation, manipulation, and detection of spin current are the major challenges in the field of spintronics and spin caloritronics. Here, we report systematic studies on the conversion of magnonic spin current to electronic charge current by the spin Seebeck effect (SSE) and that to spin-polarized charge current by the anomalous Nernst effect (ANE) in several materials. We not only show the ANE and SSE in ferromagnetic metal and insulator, but also demonstrate that the thermocouple effect associated with the thermal Hall effect (THE) is inevitable. [1, 2] By designing several special measured geometries, we are able to study the contribution of THE, SSE, and ANE for the first time, despite sharing the same field symmetry among them. Furthermore, the spin polarized current by the ANE can be significantly enhanced in the ferromagnetic thin films by up to one order of magnitude [3], and the spin current excited by the SSE is insensitive to crystal structures of the material [4]. Consequently the pure spin current generated by the SSE is robust and a powerful tool for studying spin Hall materials. [5] In this talk, I will also introduce thermal excitation magnoic spin current by light. [6]
Reference:
[1] Y. J. Chen and S. Y. Huang, Phys. Rev. Lett. 117, 247201 (2016).
[2] Bo-Wei Wu, G. Y. Luo, J. G. Lin, and Ssu-Yen Huang, Phys. Rev. B 96, 060402(R) (2017).
[3] T. C. Chuang, P. L. Su, P. H. Wu, and S. Y. Huang, Phys. Rev. B 96, 174406(2017).
[4] Feng-Jen Chang, Jauyn Grace Lin, and Ssu-Yen Huang, Phys. Rev. Materials 1,031401 (R) (2017).
[5] D. Qu, S. Y. Huang, G. Y. Guo, and C. L. Chien, Phys. Rev. B 97, 024402 (2018).
[6] Y. J. Chen and S. Y. Huang, Phys. Rev. B 99, 094426 (2019).
