| 报告题目 | Pure Spin Current Phenomena |
| 报告人 | Prof. CHIEN Chialing(钱嘉陵) |
| 报告人单位 | Department of Physics and Astronomy The Johns Hopkins University |
| 报告时间 | 2014-06-09 |
| 报告地点 | 合肥微尺度物质科学国家实验室一楼科技展厅 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
Pure spin current phenomena are the latest advances from spintronics. A pure spin current without a net charge current delivers maximal spin angular momentum using a minimal carriers, hence generating much less Joule heat in metals and no heat in insulators. A pure spin current cannot be generated by the usual means except through spin Hall effect, spin pumping, and spin Seebeck effect (SSE) and a few other mechanisms.
Since the transport of spin and heat often occurs in the proximity of a ferromagnet (metal or insulator), there are unforeseen complications. For example, in the transverse SSE geometry with an in-plane (ÑxT) temperature gradient1, there is also an out-of-plane (ÑzT) temperature gradient that gives rise to the anomalous Nernst effect (ANE) for thin magnetic films on substrate. The voltages of SSE with ÑxT and ANE with ÑzT have the same field dependence, symmetry, and hence inseparable2. In contrast, the longitudinal SSE geometry, using exclusively ÑzT in a ferromagnetic insulator (e.g., YIG), has been unequivocally established in Au/YIG3, whereas the magnetic proximity effects complicate that in Pt/YIG4.
In the new field of spin caloritronics, in which one exploits the interplay of charge, spin, and heat, there are new opportunities to explore new pure spin current phenomena and devices.
[1] K. Uchida, S. Takahashi, K. Harii, J. Ieda, W. Koshibae, K. Ando, S. Maekawa, and E. Saitoh, Nature 455, 778 (2008).
[2] S. Y. Huang, W. G. Wang, S. F. Lee, R. Kwo, and C. L. Chien, Phys. Rev. Lett,. 107, 216604 (2011).
[3] D. Qu, S. Y. Huang, J. Hu, R. Wu, and C. L. Chien, Phys. Rev. Lett,. 110, 067206 (2013).
[4] S. Y. Huang, X. Fan, D. Qu, Y. P. Chen, W. G. Wang, J. Wu, T. Y. Chen, J. Q. Xiao, and C. L. Chien, Phys. Rev. Lett,. 109, 107204 (2012).
报告人简介：
钱嘉陵教授，约翰霍普金斯大学物理学首席教授、材料科学与工程研究中心主任。毕业于台湾东海大学，在卡内基·梅隆大学获得了物理学硕士和博士学位。他是美国物理学会院士、美国科学促进会（AAAS）院士、美国物理协会会员，同时也是南京大学、兰州大学、复旦大学的名誉教授。2004年获得了美国物理学会大卫阿德勒奖，2005年被评为IEEE磁学会2005年杰出讲师，2012年他又成为了亚洲联合磁学协会第一人。 |
