Study of the cavity-magnon-polariton transmission line shape  

作　　者：Michael Harder LiHui Bai Christophe Match Jesko Sirker CanMing Hu 

机构地区：[1]Department of Physics and Astronomy, University of Manitoba

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第11期70-80,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Natural Sciences and Engineering Research Council of Canada (NSERC)-Canada Graduate Scholarships-Doctoral Program, the NSERC (Jesko Sirker and Can-Ming Hu);the National Natural Science Foundation of China (Grant No. 11429401);the Canada Foundation for Innovation and Canadian Microelectronics Corporation Grants (Can Ming Hu)

摘　　要：We experimentally and theoretically investigate the microwave transmission line shape of the cavity-magnon-polariton(CMP)created by inserting a low damping magnetic insulator into a high quality 3D microwave cavity. While fixed field measurements are found to have the expected Lorentzian characteristic, at fixed frequencies the field swept line shape is in general asymmetric. Such fixed frequency measurements demonstrate that microwave transmission can be used to access magnetic characteristics of the CMP,such as the field line width H. By developing an effective oscillator model of the microwave transmission we show that these line shape features are general characteristics of harmonic coupling. At the same time, at the classical level the underlying physical mechanism of the CMP is electrodynamic phase correlation and a second model based on this principle also accurately reproduces the experimental line shape features. In order to understand the microscopic origin of the effective coupled oscillator model and to allow for future studies of CMP phenomena to extend into the quantum regime, we develop a third, microscopic description,based on a Green's function formalism. Using this method we calculate the transmission spectra and find good agreement with the experimental results.We experimentally and theoretically investigate the microwave transmission line shape of the cavity-magnon-polariton（CMP）created by inserting a low damping magnetic insulator into a high quality 3D microwave cavity. While fixed field measurements are found to have the expected Lorentzian characteristic, at fixed frequencies the field swept line shape is in general asymmetric. Such fixed frequency measurements demonstrate that microwave transmission can be used to access magnetic characteristics of the CMP,such as the field line width H. By developing an effective oscillator model of the microwave transmission we show that these line shape features are general characteristics of harmonic coupling. At the same time, at the classical level the underlying physical mechanism of the CMP is electrodynamic phase correlation and a second model based on this principle also accurately reproduces the experimental line shape features. In order to understand the microscopic origin of the effective coupled oscillator model and to allow for future studies of CMP phenomena to extend into the quantum regime, we develop a third, microscopic description,based on a Green＇s function formalism. Using this method we calculate the transmission spectra and find good agreement with the experimental results.

关 键 词：cavity-magnon-polariton strong-coupling microwave cavity ferromagnetic resonance 

分 类 号：TN811[电子电信—信息与通信工程] TP391.41[自动化与计算机技术—计算机应用技术]