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℃.
Received: 06 July 2008
Revised: 19 August 2008
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: 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).
Cite this article:
Han Man-Gui(韩满贵), Ou Yu (欧雨), Liang Di-Fei (梁迪飞), and Deng Long-Jiang(邓龙江) Annealing effects on the microwave permittivity and permeability properties of Fe79Si16B5 microwires and their micowave absorption performances 2009 Chin. Phys. B 18 1261
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