课题组成员近日在国内外磁学会议上报告研究成果
课题组成员近日在国内外磁学会议上报告研究成果:
1. 12th International Symposium on Metallic Multilayers, Leeds, UK, 13 July-18 July 2025
景可语博士以海报形式报告了自旋转矩驱动亚铁磁畴壁运动的最新结果。
袁怀洋以口头报告形式介绍了课题组在自旋波和表面等离激元耦合方面的研究工作，重点关注了表面等离激元的激发对自旋惯性 (spin inertia) 效应的探测。自旋惯性使得自旋除了绕着外磁场做进动之外 (precession)，还会沿着进动轨道章动 (nutation)。目前自旋惯性的物理机制及其在磁性金属和绝缘体里的普适性仍然是开放性问题，我们的结果为磁性系统里自旋惯性的普适性研究提供了一个理论方案。
2. 第19届全国磁学理论会议，呼和浩特，内蒙古，7月21日到24日
袁怀洋以邀请报告的形式介绍了表面等离激元的激发对超快自旋流的放大效应 (H. Y. Yuan et al., arXiv:2505.18045)，这个发现将等离激元的研究与自旋电子学的核心问题之一即自旋流的调控结合在一起，进一步丰富了plasmonic spintronics的研究范畴。报告主要内容如下：
A key challenge in the emerging plasmonic spintronics is whether we can harness the extraordinary field-enhancement of plasmons to overcome the efficiency limitations in spin current generation. Here we consider a hybrid structure comprised of gold nanoparticles, a ferromagnet and a normal metal. For a metallic magnet, incident light shines on the system and excites surface plasmons in the nanoparticles, enhancing the electric fields on the magnetic surface. The enhanced fields then amplify the electron-magnon scattering rate in the magnet and increase the spin current by a factor of two. The physics is even more interesting for an ultrathin insulating magnet. The nanoparticles and metallic substrate form a nanocavity, which can strongly trap the electromagnetic waves in the sub-wavelength regime and produces an enhanced spin current emission at the interface of magnet and normal metal. The enhancement rate can reach up to two orders of magnitude as compared to the case without the gold nanoparticles for the commonly used YIG/Au hybrid structures. Such a giant amplification provides tremendous opportunities to innovate the existing strategy of spin current generation.
