Sekiguchi Koji, Lee Seo-Won, Sukegawa Hiroaki, Sato Nana, Oh Se-Hyeok, McMichael R D, Lee Kyung-Jin
Department of Physics, Keio University, Hiyoshi 3-14-1, Yokohama 223-8522, Japan.
JST-PRESTO, Gobanchon 7, Chiyoda-ku, Tokyo 102-0076, Japan.
NPG Asia Mater. 2017;9. doi: 10.1038/am.2017.87. Epub 2017 Jun 30.
The information carrier of modern technologies is the electron charge whose transport inevitably generates Joule heating. Spin-waves, the collective precessional motion of electron spins, do not involve moving charges and thus avoid Joule heating [1-3]. In this respect, magnonic devices in which the information is carried by spin-waves attract interest for low-power computing. However implementation of magnonic devices for practical use suffers from low spin-wave signal and on/off ratio. Here we demonstrate that cubic anisotropy materials can enhance spin-wave signals by improving spin-wave amplitude as well as group velocity and attenuation length. Furthermore, cubic anisotropy material shows an enhanced on/off ratio through a laterally localized edge mode, which closely mimics the gate-controlled conducting channel in traditional field-effect transistors. These attractive features of cubic anisotropy materials will invigorate magnonics research towards wave-based functional devices.
现代技术的信息载体是电子电荷，其传输不可避免地会产生焦耳热。自旋波是电子自旋的集体进动运动，不涉及移动电荷，因此避免了焦耳热[1 - 3]。在这方面，信息由自旋波携带的磁振子器件因其适用于低功耗计算而备受关注。然而，实际应用中的磁振子器件存在自旋波信号低和开/关比低的问题。在此，我们证明立方各向异性材料可以通过提高自旋波幅度以及群速度和衰减长度来增强自旋波信号。此外，立方各向异性材料通过横向局域化边缘模式表现出增强的开/关比，该模式与传统场效应晶体管中的栅极控制导电通道极为相似。立方各向异性材料的这些吸引人的特性将推动磁振子学朝着基于波的功能器件的研究发展。
