（北京航空航天大学）

报告摘要：
Spin waves may enable low-power devices based on spin information transmission that is free of Joule heating. Antiferromagnetic-type spin waves have intrinsic advantages, such as high speed, dual- polarized and robust against external field perturbation. To date, antiferromagnetic-type propagating spin waves excitation and manipulation have remained challenging. Here, we demonstrate current-controlled stripe domains with
alternating upward and downward magnetization in La0.67Sr0.33MnO3 thin films, which host spin-wave propagation. A frequency mode around 10 GHz higher than the ordinary low-frequency modes is observed and the dispersion of this mode is different from the low-frequency ones. We developed a theoretical model based on two oppositely oriented coupled domains, which accounts the high-frequency mode an effective antiferromagnetic spin-wave mode. The spin waves can even propagate at zero magnetic field, with group velocities of 2.6 km s-1. The orientation of the stripe domains can be controllably modified by an electric current pulse with a density of only 105 A cm-2, which opens up perspectives for reconfigurable magnonic devices [1].
[1] C. Liu et al, Current-controlled propagation of spin waves in antiparallel, coupled domains.
Nat. Nanotechnol. 14, 691-697 (2019)

报告人简介：
于海明，北京航空航天大学集成电路科学与技术学院教授、博士生导师。2006年本科毕业于北京大学物理系，2011年博士毕业于瑞士洛桑联邦理工大学（EPFL），2011-2014年于慕尼黑工业大学（TU Munich）从事博士后研究，2014年入职北京航空航天大学， 从事自旋电子学研究。主要研究方向包括自旋波电子学、热自旋电子学、自旋波量子计算等。SCI发表论文五十余篇，其中包括1篇Nat. Nanotechnol., 1篇Phys. Rep., 3篇Phys. Rev. Lett.以及4篇Nat. Commun.，撰写英文图书章节两章。2019年至今担任Physica B期刊Editor。

联系人：于国强、王文洪