腔内自旋与微波相互作用的电检测  

Electrical detection of spin-microwave coupling in a cavity

作　　者：柏利慧 田玉峰[1] 康仕寿 陈延学[1] 刘国磊[1] 梅良模[1] 颜世申[1] Lihui Bai;Yufeng Tian;Shishou Kang;Yanxue Chen;Guolei Liu;Liangmo Mei;Shishen Yan(School of Physics,Shandong University,Jinan 250100,China)

机构地区：[1]山东大学物理学院,济南250100

出　　处：《科学通报》2021年第16期2033-2041,共9页Chinese Science Bulletin

基　　金：国家自然科学基金(11774200);高等学校学科创新引智计划(B13029);山东省自然科学基金(ZR2019JQ02);山东大学青年交叉创新群体项目资助。

摘　　要：聚焦界面自旋动力学和自旋传输特性,自旋电子学发展针对自旋产生、探测、调控的技术方法,为自旋电子器件的开发提供了物理基础,是自旋电子学研究的根本任务.借鉴腔量子电动力学的思想和方法,在微波谐振腔内实现室温下的磁子-微波强耦合,为实现信息和能量在自旋与电磁波之间的相干传输提供了可能,同时为调控自旋提供了新方法.本文简要介绍了磁子-微波耦合的概念和机制,梳理了这一方向的发展脉络,重点介绍了磁子-微波强耦合中电检测技术及其产生的自旋流的特性.Via exploring the spin dynamics and transport properties at interfaces of magnetic material/non-magnetic metal bilayers,spintronics advanced many techniques on generation,detection,and manipulation of spin currents,which laid down a foundation for designing spintronic devices.New ideas and methods for manipulating spin are required in the spintronics community.Merging with cavity quantum electrodynamics,magnetic resonance in ferromagnets inside of a microwave cavity,realizes a strong magnon-microwave coupling at room temperature,opening an avenue to manipulate spin and spin current for the spintronics community.Spin-microwave coupling strength was significantly improved by replacing a few spins in a paramagnetic spin system with magnetization in ferromagnetic materials.Thus,a strongly coupled magnon-microwave system offers a hybrid quantum platform with many measures to tune the coupled system,such as an exchange magnetic field,an anisotropy field,controlled coupling strength,controlled damping parameters,and so on.Many devices were proposed and demonstrated with potential applications.In this review,we briefly introduce the concept and mechanism of magnon-microwave coupling,a classical electrodynamical coupling model for the coupling,spin currents produced by the coupled magnon,and manipulation of the spin current via the strong coupling.In ferromagnets,magnons can couple to a microwave mode as a magnon-polariton propagating in the materials.The strongly coupled magnon-microwave system is a magnon-polariton in a cavity where the microwave was confined as a resonance mode with a high quality factor.Using the Landau-Lifshitz-Gilbert equation and Maxwell equations,we introduce the classical electrodynamical coupling model and reveal that the magnon is driven by a torque produced by the microwave magnetic field on the magnetization and the microwave is feedback via Faraday’s law.Therefore,the coupling strength of the magnon-microwave system can be controlled by changing the torque.Magnon-microwave coupling is expe

关 键 词：自旋动力学 磁子-微波强耦合 磁子极化激元 自旋流 

分 类 号：O469[理学—凝聚态物理]