中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1261-1265.doi: 10.1088/1674-1056/18/3/070

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Annealing effects on the microwave permittivity and permeability properties of Fe79Si16B5 microwires and their micowave absorption performances

韩满贵, 欧雨, 梁迪飞, 邓龙江   

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2008-07-06 修回日期:2008-08-19 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60701016) and the Science Foundation for Young Faculties of UESTC (Grant Nos L08010301JX0618 and L08010301JX05013).

Annealing effects on the microwave permittivity and permeability properties of Fe79Si16B5 microwires and their micowave absorption performances

Han Man-Gui(韩满贵)†, Ou Yu (欧雨), Liang Di-Fei (梁迪飞), and Deng Long-Jiang(邓龙江)   

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2008-07-06 Revised:2008-08-19 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60701016) and the Science Foundation for Young Faculties of UESTC (Grant Nos L08010301JX0618 and L08010301JX05013).

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摘要： This paper reports that amorphous magnetic microwires (Fe79Si16B5) have been fabricated by a melt-extraction technique and have been annealed at 600℃ and 750℃ respectively. Differential scanning calorimeter measurements show that nanocrystalline magnetic phase (α-Fe) has been formed in the amorphous matrix when it was annealed at 600℃. Hard magnetic phase (Fe2B) was formed in the microwires annealed at 750℃, which increases the magnetic coercivity. Microwave permittivity and permeability are found to be dependent on the microstructures. The permittivity fitting results show that multi Lorentzian dispersion processes exist. For microwires annealed at 750℃, their resonance peaks due to the domain wall movements and natural resonance are found higher than those of microwires annealed at 600℃. The microwave absorption performance of microwires annealed at 600℃ is found better than microwires annealed at 750℃.

关键词: amorphous magnetic microwires, magnetic permeability, permittivity, microwave absorber

Abstract: This paper reports that amorphous magnetic microwires (Fe79Si16B5) have been fabricated by a melt-extraction technique and have been annealed at 600℃ and 750℃ respectively. Differential scanning calorimeter measurements show that nanocrystalline magnetic phase ($\alpha$-Fe) has been formed in the amorphous matrix when it was annealed at 600℃. Hard magnetic phase (Fe2B) was formed in the microwires annealed at 750℃, which increases the magnetic coercivity. Microwave permittivity and permeability are found to be dependent on the microstructures. The permittivity fitting results show that multi Lorentzian dispersion processes exist. For microwires annealed at 750℃, their resonance peaks due to the domain wall movements and natural resonance are found higher than those of microwires annealed at 600℃. The microwave absorption performance of microwires annealed at 600℃ is found better than microwires annealed at 750℃.

Key words: amorphous magnetic microwires, magnetic permeability, permittivity, microwave absorber

中图分类号:  (Magnetization curves, hysteresis, Barkhausen and related effects)

  • 75.60.Ej
78.70.Gq (Microwave and radio-frequency interactions) 81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization) 81.70.Pg (Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis) 75.50.Tt (Fine-particle systems; nanocrystalline materials)