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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Micromagnetic simulation and experimental study on
microwave permeability of nano-magnetic films
DENG Lian-wen(邓联文), HUANG Xiao-zhong(黄小忠), ZHOU Ke-sheng(周克省), YANG Bing-chu(杨兵初)

School of Physics Science and Technology, Central South University, Changsha 410083, China

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.

 

Key words: nano-granular film; random anisotropy model; micromagnetic simulation; ripple structure; microwave permeability

ISSN 1672-7029
CN 43-1423/U

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