| With the widespread use of microwave in the field such as military and civil application, microwave-absorbing materials have been received considerable attention. High-performance absorbers are important to acquire the excellent microwave absorbing materials. In this paper, after summarizing the relevant literatures, compared to other custom isotropic absorbing materials, one new anisotropic materials - amorphous glass-coated microwires which have the advantage of physical performance and absorbing performance, and also be compatible with the microwave-absorbing material and structural characteristic is put forward as our research.The apparatus, fabrication process and the case of the spinning method have been illuminated in this paper. The effect of synthesis conditions on the microwires was discussed. The microstructure of the microwires was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The magnetostatic parameters of the microwires samples before and after being annealed were measured by Vibrating Sample Magnetometer (VSM). Microwave electromagnetic parameters of these microwires were measured by Microwave Vector Network Analyzer. The result show that the glass cover of amouphous glass-covered Fe-rich microwires are symmetrical, and the diameter ranging from 10μm to 30μm, they have the better electromagnetic parameters during the range of 2 ~18GHz. Reflection coefficient of one-layer absorber ( 1m m thick) was nμmerically calculated. The results show that these microwires could be used for microwave absorbers operating in the several GHz range.At last, the magnetic properties of the amouphous glass-covered Fe-rich microwires were investigated using the micromagnetic method in this paper. The complex permeability with different magnetocrystalline anisotropy were simulated, the calculated spin distribution were given. The feasibility of magnetic properties simulation by micromagnetic method was discussed in theoretically. |
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