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Magnetodielectric Response of Soft Magnetoactive Elastomers: Effects of Filler Concentration and Measurement Frequency

  • The magnetodielectric response of magnetoactive elastomers (MAEs) in its dependence on filler concentration, magnetic field, and test frequency is studied experimentally. MAEs are synthesized on the basis of a silicone matrix filled with spherical carbonyl iron particles characterized by a mean diameter of 4.5 mu m. The concentration of the magnetic filler within composite materials is equal to 70, 75, and 80 mass%. The effective lossless permittivity epsilon as well as the dielectric loss tan grow significantly when the magnetic field increases. The permittivity increases and the dielectric loss decreases with increasing filler concentration. In the measurement frequency range between 1 kHz and 200 kHz, the frequency hardly affects the values of epsilon and tan in the absence of a magnetic field. However, both parameters decrease considerably with the growing frequency in a constant magnetic field. The more strongly the magnetic field is applied, the larger the change in permittivity and loss tangent at the same test frequency is observed. An equivalent circuit formulation qualitatively describes the main tendencies of the magnetodielectric response.

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Metadaten
Author:Sergei A. Kostrov, Mikhail Shamonin (Chamonine)ORCiDGND, Gennady V. StepanovORCiD, Elena Yu Kramarenko
DOI:https://doi.org/10.3390/ijms20092230
Parent Title (English):International Journal of Molecular Sciences
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of first Publication:2019
Release Date:2022/02/01
Tag:MAGNETIC-FIELD; dielectric loss; magnetic filler; magnetoactive elastomers; magnetodielectric effect; permittivity
Volume:20
Issue:9
Article Number:2230
First Page:1
Last Page:13
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International