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Broadband Permeability Spectra of Flake-Shaped Ferromagnetic Particle Composites

机译:片状铁磁颗粒复合材料的宽带磁导谱

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Broadband permeability spectra of aligned ferromagnetic flakes embedded in a nonmagnetic polymer matrix have been measured using an APC-7 coaxial line within the frequency range 10 MHz-18 GHz. These spectra reveal two well-defined resonance lines. The low-frequency one (sub-GHz range) has previously been attributed to the fundamental vortex translation mode in a multidomain magnetic structure, whereas the high-frequency resonance (beyond 1 GHz) is assigned to the natural spin resonance. A two-level analytical model combining a spin dynamics description including these two contributions at the flake scale and a Maxwell-Garnett mixing rule at the composite scale has been developed and reproduces very satisfactorily the experimental spectra in terms of resonance frequencies, resonance linewidths, and resonance mode amplitudes.
机译:已使用10 MHz-18 GHz频率范围内的APC-7同轴线测量了嵌入非磁性聚合物基质中的定向铁磁薄片的宽带磁导率谱。这些光谱揭示了两条清晰的共振线。低频(亚GHz范围)以前已归因于多畴磁性结构中的基本涡旋平移模式,而高频共振(超过1 GHz)被分配给自然自旋共振。已经建立了一个两级分析模型,该模型结合了自旋动力学描述(包括片状尺度的这两个贡献)和复合尺度的麦克斯韦-加纳特混合规则,并且在共振频率,共振线宽和共振频率方面非常令人满意地重现了实验光谱。共振模式振幅。

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