Magnetoelectric coupling in Fe3O4/P(VDF-TrFE) nanocomposites

Abstract : Nanocomposite films composed of nanoparticles Fe3O4 embedded in copolymers of vinylidene fluoride and trifluoroethylene P(VDF-TrFE) (70/30) have been elaborated. The effect of Fe3O4 content on the cristallinity ratio, dielectric and magnetoelectric properties of the nano-piezo-composites was studied and discussed. Dielectric characterization showed an increase of the permittivity and a decrease of the resistivity with the increasing ratio of nanofillers. Thermal analysis revealed a decrease of the cristallinity of the composite. Poling process was found to be difficult for Fe3O4 contents higher than 1%, because of the low breakdown fields and diminished resistivity with increasing Fe3O4 content. As a consequence, magnetoelectric measurements were conducted only on nanocomposites with Fe3O4 contents lower than 0.5% in the case of poled samples. The optimal value of the first order magnetoelectric (ME) coefficient αpαp was obtained for a nanoparticles content of 0.3% wt.
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Rabah Belouadah, Laurence Seveyrat, Daniel Guyomar, Benoit Guiffard, Fouad Belhora. Magnetoelectric coupling in Fe3O4/P(VDF-TrFE) nanocomposites. Sensors and Actuators A: Physical , Elsevier, 2016, 247, pp.298-308. ⟨10.1016/j.sna.2016.06.013⟩. ⟨hal-01516764⟩

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