Co-A1-O磁性纳米颗粒膜微波磁性研究  

Microwave magnetism of Co-A1-O nano-granular film

作　　者：舒畅[1] 邓联文[1,2] 杨兵初[1] 熊健[1] 左舜贵[1] 梁丽杰[1] 

机构地区：[1]中南大学物理科学与技术学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第2期472-476,共5页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划(“973”计划)项目(2011CB605804);湖南省自然科学基金资助项目(10JJ5049);粉末冶金国家重点实验室开放基金资助项目(2010年、2011年)

摘　　要：通过实验研究和理论计算模拟研究Co-A1-O磁性纳米颗粒膜的微波磁性。首先采用双靶反应磁控溅射工艺制备Co-A1-O磁性纳米颗粒膜,探讨工艺条件对薄膜微波磁谱的影响;然后,利用Landau-Lifshitz-Gilbert方程和Bruggeman有效媒质理论,计算模拟主要磁参量变化对磁性纳米颗粒膜磁谱的影响。研究结果表明:增大Co靶溅射功率,可使磁性颗粒间因分布电容效应引起的涡流损耗增加,从而使磁谱的共振线宽增大;阻尼系数增大导致磁导率频谱的共振线宽增大趋势与实验结果基本一致。To research magnetic characteristics of nano-granular film such as Co-Al-O in the microwave range,related research was studied experimentally and theoretically.Co-Al-O nano-granular films with high microwave permeability were synthesized by magnetron sputtering technology and effect of the major parameters on preparation was discussed.Analytic calculation of effective permeability frequency spectra of the nano-granular thin film was presented based on the Landau-Lifshitz-Gilbert equation and Bruggeman effective medium theory.The results show that the eddy current losses caused by capacitive effect between the particles increase with the increase of the Co sputtering power,and the resonance linewidth broadens.Increased damping parameter will broaden the absorption bandwidth.The simulation results agrees well with the experimental ones.

关 键 词：Co-Al-O颗粒膜 磁导率 LLG方程 有效媒质理论 

分 类 号：TM271[一般工业技术—材料科学与工程]