2019
DOI: 10.3390/ijms20092230
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Magnetodielectric Response of Soft Magnetoactive Elastomers: Effects of Filler Concentration and Measurement Frequency

Abstract: 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 µm. The concentration of the magnetic filler within composite materials is equal to 70, 75, and 80 mass%. The effective lossless permittivity ε′ as well as the dielectric loss tanδ grow significantly whe… Show more

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Cited by 18 publications
(11 citation statements)
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“…However, some other phenomena have also attracted much attention. Among them are magnetodeformational effect [ 13 , 14 , 15 , 16 , 17 , 18 ], i.e., significant deformations of MAE samples in homogeneous and gradient or alternating magnetic fields, magnetodielectric effect as well as magnetoresistance of MAEs [ 19 , 20 , 21 , 22 , 23 ], i.e., a tremendous increase in both relative permittivity and conductivity of samples in homogeneous magnetic fields. Furthermore, MAEs demonstrate magnetically controlled radio-absorbing properties [ 24 , 25 , 26 ] that are promising for the design of magneto-controllable radio-shielding or polarizing covers on their basis.…”
Section: Introductionmentioning
confidence: 99%
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“…However, some other phenomena have also attracted much attention. Among them are magnetodeformational effect [ 13 , 14 , 15 , 16 , 17 , 18 ], i.e., significant deformations of MAE samples in homogeneous and gradient or alternating magnetic fields, magnetodielectric effect as well as magnetoresistance of MAEs [ 19 , 20 , 21 , 22 , 23 ], i.e., a tremendous increase in both relative permittivity and conductivity of samples in homogeneous magnetic fields. Furthermore, MAEs demonstrate magnetically controlled radio-absorbing properties [ 24 , 25 , 26 ] that are promising for the design of magneto-controllable radio-shielding or polarizing covers on their basis.…”
Section: Introductionmentioning
confidence: 99%
“…It should be mentioned that the magnetodielectric effect (MDE) and magnetoconductivity of MS and MH MAEs in an applied magnetic field have been previously studied in a number of publications [ 19 , 20 , 21 , 22 , 23 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. Within the general approach, the value of MAE permittivity can be obtained from the measurements of the capacity of a capacitor filled with an MAE [ 22 , 23 , 40 , 41 , 42 ]. A strong increase in the capacitance was observed when the magnetic field was applied perpendicular to the capacitor plates [ 40 , 41 ].…”
Section: Introductionmentioning
confidence: 99%
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“…As a rule, the electrorheological effect for structured elastomers is greater than for materials with a stochastic distribution of filler particles, which is associated with the smaller distance between the particles of the disperse phase. Anisotropically-filled elastomers are also characterized by a higher dielectric constant and Maxwell–Wagner dispersion [ 32 , 33 , 34 ].…”
Section: Introductionmentioning
confidence: 99%