报告题目 ：Spin waves in magnetic insulators 

报告人：   沈卡 教授（北京师范大学） 

报告时间：2024年5月10日（星期五）14：00-15：00

报告地点：北洋园校区 49 教 410 室 （线上：腾讯会议 838-9499-4192）

报告摘要：

       Spin waves or their quanta, magnons, in magnetic insulators are regarded as potential information carriers for low-consumption devices. As the spin wave properties in the star material, YIG (yttrium iron garnet), have been intensively investigated, other family members of rare-earth iron garnets have recently attracted increasing research interest partially because of the coexistence and the controllability of opposite magnon chiralities. In this talk, I would like to share the story about the discovery of spin Seebeck anomaly originating from magnon-polarons, hybrid modes of magnon and phonon [1], as well as our recent progresses on magnon-polarons [2-4] and magnon-magnon coupling [5] in rare-earth iron garnets.

报告人简介：

      Ka Shen received his B.S. and Ph.D. degrees from University of Science and Technology of China in 2007 and 2012, respectively. He  then worked as postdoc at University of Missouri-Columbia and Delft University of Technology. In 2017, he joined the Center for Advanced Quantum Studies and Department of Physics at Beijing Normal University. His research interests focus on  spin dynamics and spin transport in electronic and magnonic systems, in particular the spin-charge conversion and phonon-associated spin transport.

参考文献：

[1] T. Kikkawa, K. Shen, B. Flebus, R.A. Duine, K-i. Uchida, Z. Qiu, G.E.W. Bauer, E. Saitoh, “Magnon Polarons in the Spin Seebeck Effect”, Phys. Rev. Lett. 117, 207203 (2016).

[2] K. Shen, Phys. Rev. B 99, 024417 (2019).

[3] B. Yang; S. Y. Xia; H. Zhao; G. Liu; J. Du; K. Shen; Z. Qiu; D. Wu, “Revealing thermally driven distortion of magnon dispersion by spin Seebeck effect in Gd3Fe5O12”, Phys. Rev. B 103, 054411 (2021).

[4] Y. Li, Y. Duan, M. Wang, L. Lang, Y. Zhang, M. Yang, J. Li, W. Fan, K. Shen, Z. Shi, and S.-M. Zhou, "Giant magnon-polaron anomalies in spin Seebeck effect in double umbrella-structured Tb3Fe5O12 films", Phys. Rev. Lett. 132, 056702 (2024).

[5] Y. Li, Z. Zhang, C. Liu, D. Zheng, B. Fang, C. Zhang, A. Chen, Y. Ma, C. Wang, H. Liu, K. Shen, A. Manchon, J. Q. Xiao, Z. Qiu, C.-M. Hu, and X. Zhang, "Reconfigurable spin current transmission and magnon-magnon coupling in hybrid ferrimagnetic insulators", Nat. Commun. 15, 2234 (2024).