Annealing effects on the microwave permittivity and permeability properties of Fe79Si16B5 microwires and their micowave absorption performances |
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| Authors: | Han Man-Gui Ou Yu Liang Di-Fei and Deng Long-Jiang |
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| Institution: | State Key Laboratory of Electronic Thin Films and
Integrated Devices, University of Electronic Science and
Technology of China, Chengdu 610054, China |
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| 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 (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℃. |
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| Keywords: | amorphous magnetic microwires magnetic permeability permittivity microwave absorber |
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