磁子转矩翻转磁矩研究

Magnetization switching by magnon torque

磁子是自旋波量子化的准粒子。磁子具有在绝缘磁性材料中无热耗散、低阻尼、长距离传输自旋的优势,避免了因电荷流动而产生焦耳热,可以克服日益显著的器件发热问题,因此磁子器件在低功耗信息存储与计算领域具有潜在应用前景。文章首先介绍了自旋波和磁子的概念,磁子具有的优势和研究价值;然后总结了磁子在铁磁和反铁磁绝缘体中输运以及新型磁子器件方面的最新研究结果;最后详细介绍了室温下实现磁子转矩驱动磁矩翻转的最新研究工作。这些工作对发展磁子学,实现低功耗、高速磁子型器件及应用具有较为重要的现实意义。

Magnons are the quanta of spin waves,which exhibit the advantages of heat-dissipation-free and low-damping transfer of spin information over micrometeror even millimeter long distances in magnetic insulators,so that Joule heating due to charge flow can be avoided.This can overcome the increasingly significant issue of heat dissipation in electronic devices,so magnon-based devices have great potential in low-power,high-efficiency information storage and computing applications.In this review we first introduce the concepts of spin waves and magnons,and the advantages of magnons for research,then review recent studies of magnon transport in ferromagnetic and antiferromagnetic insulators,as well as new designs of magnonic devices.Finally,we present in detail our recent work on magnon torque induced magnetization switching at room temperature.This work is of significance for the development of magnonics and low-power,high-speed magnonic devices.