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In situ microwave characterization of microwire composites with external magnetic field

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5 Author(s)
Qin, F.X. ; Université Européenne de Bretagne, Lab-STICC, Université de Brest, CS 93837, 6 Avenue Le Gorgeu, 29238 Brest Cedex 3, France ; Brosseau, C. ; Peng, H.X. ; Wang, H.
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Rubber composites containing Co68.15Fe4.35Si12.25B15.25 glass-covered amorphous microwires were fabricated. For samples containing 5 mm long wires and randomly dispersed in the polymer matrix, our results demonstrate that the current induces resonance of circumferential permeability (magnetoimpedance resonance) resulting in a significant change of the effective permittivity of the wire-filled composites with application of a high magnetic field. For samples containing longer wires (70 mm) periodically arranged in the polymer matrix, the permittivity spectrum shows two resonance peaks due to, respectively, dipole and magnetoimpedance resonance. The induced magnetoimpedance resonance has a narrower linewidth than the dipole one as magnetic field is increased.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 19 )

Date of Publication:

May 2012

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