Control of Spin Current in Artificially Twisted Spin Structures

理解自旋电流与磁化强度之间的相互作用是自旋电子学器件发展中的一个重要问题。在本研究项目中，制备了由硬磁L10-FePt和软磁坡莫合金（FeNi合金）组成的双层膜，并在双层膜中人工形成扭转自旋结构。研究了双层膜的磁化动力学，并利用双层膜中的自旋波模式发展了高效的磁化翻转技术。此外，在具有扭曲自旋结构的纳米柱中成功地观察到了电流诱导的磁化翻转。

The understanding of interaction between “spin current" and “magnetization" is an essential issue for the development of spintronic devices. In this research project, bilayers consisting of hard magnetic L10-FePt and soft magnetic Permalloy (FeNi alloy) were prepared, and twisted spin structures were artificially formed in the bilayers. The magnetization dynamics of the bilayers were investigated, and the high efficient magnetization switching technique was developed using the spin wave mode in the bilayers. Also, the current-induced magnetization switching was successfully observed in the nanopillars with a twisted spin structure.