磁性绝缘体/重金属非局域结构中的磁振子输运行为  

Behavior of Magnons Transport in Non-Local Structure Composed of Magnetic Insulator and Heavy Metal

作　　者：吴勇 蔡玉珍 姜勇[1] Wu Yong;Cai Yuzhen;Jiang Yong(School of Materials Science&Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《稀有金属》2019年第11期1236-1242,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51731003)资助

摘　　要：磁振子是携带一个单位自旋角动量(?)的准粒子,作为下一代信息存储的有力竞争者,其输运行为是当前绝缘体自旋电子学所研究的核心内容。非局域的磁性绝缘体/重金属双层膜是研究磁振子输运行为的典型结构,利用重金属材料的自旋霍尔效应和逆自旋霍尔效应,可以通过纯电学方法表征、分析磁振子的输运行为。本文以亚铁磁绝缘体钇铁石榴石Y3Fe5O12(YIG)为例,简要介绍了YIG薄膜的生长方法, YIG/Pt非局域器件的制备工艺以及电学手段探测电激发、热激发磁振子非局域信号的方法。着重对影响YIG/Pt非局域结构中磁振子信号的主要因素进行了梳理,目前实验上已经证实YIG薄膜的厚度、外加磁场的强度、注入电流的大小、探测温度以及YIG薄膜的磁结构都会对磁振子输运的非局域信号产生影响,但其内在的物理机制仍然不是十分明确。希望本文的介绍能够为后续开展磁振子输运研究的广大研究人员提供参考。Magnons are the quasi-particles with spin angular momentum of one unit of ?(reduced Planck′s constant). As a strong competitor for next generation of information storage, magnons transport is the core research content in insulator spintronics field. Magnetic insulator/heavy metal non-local structure is a typical system for studying the behavior of magnons transport which can be characterized and analyzed by pure electrical method using the spin Hall effect and inverse spin Hall effect of heavy metal materials. Taking the yttrium iron garnet Y3Fe5O12(YIG) as an example, this paper briefly introduced the growth methods of YIG films, fabrication process of YIG/Pt non-local devices and the electric method of measuring non-local signals from electrically and thermally excited magnons. The main factors affecting the magnon signals in the YIG/Pt non-local structure were reviewed. At present, experiments have confirmed that the thickness of YIG films, the strength of external magnetic field, the magnitude of injection current, the detection temperature and the magnetic structure of YIG films will affect on the non-local signal of the magnon transport, but their internal physical mechanisms were still not very clear. It is hoped that the introduction of this paper can provide a reference for the researchers focusing on magnons transport in future.

关 键 词：钇铁石榴石 磁振子 磁振子拖拽磁电阻 自旋塞贝克 非局域结构 

分 类 号：TM271[一般工业技术—材料科学与工程]