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Micromagnetic simulation and experimental study on microwave permeability of nano-magnetic films

机译:纳米磁性薄膜的微波透过率的微磁模拟和实验研究

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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.
机译:从在微波波段的应用角度出发,对纳米结构磁性薄膜进行了理论和实验研究,通过有限元方法模拟了纳米磁性薄膜的微磁结构,得到了典型的微磁性,并进行了相应的实验。结果表明纳米磁性薄膜的特性与微磁波纹理论相吻合。纳米磁性薄膜的微波渗透率推导并很好地拟合了Landau-Lifshitz-Gilbert( LLG)方程。薄膜呈现出较大的微波渗透率和较高的共振频率(2 GHz时的μ'和μ''分别约为100和40,共振频率约为2.8 GHz)。μ''的附加峰源自垂直各向异性和通过退火过程可以抑制微磁波纹结构。因此,这些纳米磁性膜的微波复磁导率谱为不同的应用量身定制。

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