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Microwave Shielding Characteristics of {\hbox {PMMA/BiFeO}}_{3} Composites

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5 Author(s)
Wen Hsien Sun ; Nanotechnol. Res. Center, Ind. Technol. Res. Inst., Hsinchu, Taiwan ; Dung Shing Hung ; Tsing Tang Song ; Yen Pei Fu
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BiFe1-xSmxO3 composites with different samarium (Sm) concentration (x=5-20%) in BFO3 were fabricated by the solid-state method. Their structure and magnetic property due to the samarium substitution in BFO3 were analyzed by the X-ray diffractometer and vibration sample magnetometer responses, respectively. The complex permeability (μ = μ'-jμ") and shielding effectiveness (SE) of powder-resin composites consisting of magnetic particles (BiFe1-xSmxO3) embedded into a dielectric matrix (PMMA) were studied at the microwave frequencies. The samarium concentration dependence of permeability and SE was measured using the free-space method. We found that the magnetic properties of the Sm-substitute BFO3 mainly lead to the shielding effect for the PMMA/BiFe1-xSmxO3 composites. In this paper, we demonstrate the gradual change of the shielding effect and permeability of the PMMA/BiFe1-xSmxO3 composites in the microwave range.

Published in:

Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 10 )

Date of Publication:

Oct. 2011

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