Applicability of effective medium theory to ferroelectric/ferrimagnetic composites with composition and frequency-dependent complex permittivities and permeabilities

Applicability of effective medium theory to ferroelectric/ferrimagnetic composites with composition and frequency-dependent complex permittivities and permeabilities

High-frequency (1 MHz–1 GHz) transmission line measurements were used to determine the composition and frequency-dependent complex permittivities and complex permeabilities of ferroelectric/ferrimagnetic (barium titanate and a magnesium-copper-zinc ferrite) composites. The effective medium rules of...

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Veröffentlicht in:Journal of applied physics 1996-02, Vol.79 (3), p.1655-1660
Hauptverfasser: Mantese, Joseph V., Micheli, Adolph L., Dungan, Dennis F., Geyer, Richard G., Baker-Jarvis, James, Grosvenor, John
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container_end_page 1660
container_issue 3
container_start_page 1655
container_title Journal of applied physics
container_volume 79
creator Mantese, Joseph V.
Micheli, Adolph L.
Dungan, Dennis F.
Geyer, Richard G.
Baker-Jarvis, James
Grosvenor, John
description High-frequency (1 MHz–1 GHz) transmission line measurements were used to determine the composition and frequency-dependent complex permittivities and complex permeabilities of ferroelectric/ferrimagnetic (barium titanate and a magnesium-copper-zinc ferrite) composites. The effective medium rules of Maxwell–Garnett give both lower and upper bounds for the effective permittivities and permeabilities and yield accurate estimates of the bulk electric and magnetic properties at low volume fill fraction of either component provided the proper host matrix is chosen. Bruggeman theory yielded the best predictive values for the permittivity and permeability over the entire composition range. In all cases these complex quantities were shown to be constrained by Bergman–Milton bounds.
doi_str_mv 10.1063/1.361010
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title Applicability of effective medium theory to ferroelectric/ferrimagnetic composites with composition and frequency-dependent complex permittivities and permeabilities
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