报告题目：Magnetic texture based magnonics

报告人：  肖江 教授（复旦大学）

报告时间：2019 年 12 月 10 日（周二）14：00 -- 15：00

报告地点：北洋园校区32教218室

报告摘要:

As a collective quasiparticle excitation of the magnetic order, spin wave can propagate in both conducting and insulating materials with little dissipation. Magnetic material with non-trivia magnetic texture provides a unified information memory and processing platform [1, 2]. We demonstrate that, in the presence of Dzyaloshinskii-Moriya interaction, an antiferromagnetic domain wall acts as a spin wave polarizer or a spin wave retarder [3]. Based on the same principle, the spin wave driven domain wall motion in antiferromagnet also strongly depends on the linear polarization of the injected spin waves [4].

Utilizing this interplay between the spin wave and the magnetic textures, we construct a universal spin wave logic gate, which can realize all unary and binary logic operation in one single hardware structure. Based on the universal spin wave gate, we illustrate a full functional spin wave computer.

参考文献

[1]. Lan, J., Yu, W., Wu, R. & Xiao, J., Phys. Rev. X 5, 041049 (2015).

[2]. Yu, W., Lan, J., Wu, R. & Xiao, J., Phys. Rev. B 94, 140410(R) (2016).

[3]. Lan, J., Yu, W. & Xiao, J., Nature Communications 8, 178 (2017).

[4]. Yu, W., Lan, J., & Xiao, J., Phys. Rev. B 98, 144422 (2018).

报告人简介：Prof. Jiang Xiao received his B. S. in Physics from Peking University in 2001, and Ph. D. from Georgia Institute of Technology in 2006. After a postdoctoral research in Kavli Institute of NanoScience at Delft University of Technology in The Netherlands, he joined Fudan University in 2009. His research is on the theoretical condensed matter physics, and focuses on spintronics, including spin transport in magnetic nanostructures, magnetization dynamics, parametric pumping, and more recently on magnonics.

代表性论著:

1. Tserkovnyak, Y. * & Xiao, J.* Energy Storage via Topological Spin Textures. Phys. Rev. Lett. 121, 127701 (2018).

2. Lan, J., Yu, W. & Xiao, J. * Antiferromagnetic domain wall as spin wave polarizer and retarder. Nature Communications 8, 178 (2017).

3. Lan, J., Yu, W., Wu, R. & Xiao, J. * Spin-Wave Diode. Phys. Rev. X 5, 041049 (2015).

4. Cheng, R. *, Xiao, J. *, Niu, Q. & Brataas, A. Spin Pumping and Spin-Transfer Torques in Antiferromagnets. Phys. Rev. Lett. 113, 057601 (2014).

5. Xiao, J., Bauer, G. E. W., Uchida, K., Saitoh, E. & Maekawa, S. Theory of magnon-driven spin Seebeck effect. Phys. Rev. B 81, 214418 (2010).