Micromagnetic simulation and experimental study on microwave permeability of nano-magnetic films
来源期刊:中国有色金属学报(英文版)2007年增刊第1期(Part ⅡB)
论文作者:邓联文 黄小忠 周克省 杨兵初
文章页码:756 - 759
Key words:nano-granular film; random anisotropy model; micromagnetic simulation; ripple structure; microwave permeability
Abstract: From the point of view of application in the microwave band, the theoretic and experimental researches of nanostructural magnetic films were carried out. Micromagnetic structure of the nano-magnetic film was simulated by the finite element method. The typical micromagnetic was obtained. Corresponding experiments were also done aiming at the Co40Fe40B20-SiO2 nano-granular films. The results show that the characteristics of nano-magnetic film correspond with the micromagnetic ripple theory. The microwave permeability of nano-magnetic films deduces and well fits the Landau-Lifshitz-Gilbert (LLG) equation. The films present large microwave permeability and high resonant frequency (μ′ and μ″ at 2 GHz are about 100 and 40 respectively and the resonant frequency is about 2.8 GHz). The additional peak of μ″ originated from perpendicular anisotropy and micromagnetic ripple structure can be suppressed by the annealing process. Thus, the microwave complex permeability spectra of these nano-magnetic films can be tailored for different applications.
基金信息:National Natural Science Foundation of China