YIG/Pt非局域结构中磁振子输运的界面调控研究

磁振子，特别是磁性绝缘体中的磁振子，被认为很可能成为下一代的信息载体。人们可以通过对磁振子的操纵，实现信息的存储、传输和处理。因为磁性材料的电子结构、磁结构和奈尔矢量等均对表面和界面较为敏感，在超薄的铁磁或反铁磁绝缘体薄膜中，磁振子的自旋输运行为很可能实现更大范围的调控，同时有可能发现一些新奇的物理现象。本项目中，我们准备针对YIG/Pt非局域结构中的磁振子输运行为进行系统研究。首先将采用超薄的YIG薄膜，利用离子轰击、注入、界面反应等方法改变YIG/Pt界面的电子结构，研究其对磁振子输运的影响；此外，将借助于反铁磁材料，通过调控YIG与反铁磁界面的反铁磁一侧的奈尔矢量，进而实现对YIG中磁振子的调控。本项目的研究工作对理解超薄铁磁绝缘材料中磁振子输运的物理本质具有重要的物理意义和潜在的实际应用价值。

Magnons, especially for those in magnetic insulators, are considered likely to be the next generation information carriers. People can realize the information storage, transport and process through manipulating magnons. Because the electronic structures, magnetic structures and Nêel vectors of magnetic materials are all sensitive to surfaces and interfaces, the spin transport of magnons is likely to achieve a wider range of regulation in ultra-thin ferromagnetic or antiferromagnetic insulator films, and some novel physical phenomena may be observed. In this project, we plan to systematically study the magnon transport behaviors in YIG/Pt nonlocal structures. First, ultrathin YIG films will be used to change the electronic structures of YIG/Pt interfaces by ion bombardment, implantation and interfacial reaction, and their effects on magnon transport will be studied. In addition, with the help of antiferromagnetic materials, the control of the magnons in YIG will be realized by adjusting the Nêel vectors on the antiferromagnetic side of the interface between YIG and the antiferromagnet. This work has important physical significance and potential practical application value for understanding the magnon transport in ultra-thin ferromagnetic insulator films.