The dielectric properties of polyvinylidene fluoride (PVDF) and nickel (Ni) composites annealed under external magnetic fields were studied here. It was found that a similar percolation effect could be induced by an external longitudinal magnetic field in low filler PVDF/Ni composites. The permittivity of PVDF/Ni (95/5) composites showed a 4 times improvement at low frequency, and the dielectric loss was kept in the range of 0.1−0.4. In comparison to the traditional percolation effect caused by the involvement of conductive particles, field-induced anisotropic percolation may be another type of percolation effect, which can be used to improve the dielectric properties of polymer-based composites.
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Li et al. (2010) studied this question.