About the electromagnetic properties of the Fe-Si-B-Nb-Cu soft magnetic composites

作者：Ionescu D^*; Ciobanu I B

来源：Journal of Optoelectronics and Advanced Materials, 2008, 10(12): 3305-3310.

• Soft magnetic composite
• Finemet alloys
• Nanocrystalline phase
• Structural modeling
• Magnetic anisotropy
• Microwave range

A class of soft magnetic composites has been analyzed in this paper: the Fe-Si-B-Nb-Cu (Finemet) alloys. Materials present a crystalline nanogranular structure, with a unique combination of soft magnetic properties including high permeability and high electrical resistivity. The obtained magnetic properties depend strongly on the microstructure and the phase composition of the primary nanocrystalline phase. We have used the method of structural modeling and simulations for the material characterization in HF fields (1 - 10 GHz in microwave range), considering the effects induced by the nanocrystalline structure. Alloys are multi-phases structures at the atomic scale, presenting magnetic anisotropy. Simulation results were validated by measurements of the constitutive parameters. The magnetic permeability and electric permittivity and conductivity have been calculated on the basis of a physical algorithm for the samples exposed inside a rectangular waveguide. The structural explanation of their evolutions has been pointed out.

• 出版日期2008-12