Abstract
We report the magnetic, dielectric, and magnetoelctric properties of NiFe2O4-poly (vinylidene-fluoride)-BaTiO3 composite film. The coercive field (±2Hc ∼ 344 Oe) and remnant magnetization (Mr ∼ 6.1 emu g−1) were observed at room temperature. The dielectric permittivity at room temperature (ε′RT ∼ 281) was found to decrease with increase in frequency. The magnetocapacitance was found to be ∼5.9% at an applied dc magnetic field of 8 kOe (frequency = 1 kHz). Magnetoelectric coupling coefficient (αE ∼ 4.1 mV cm−1 Oe−1) measured by dynamic method (at ac magnetic field = 30 Oe) is observed higher (two times) than those reported for some materials. In addition, we have observed the image of ferroelectric domain using piezoelectric force microscopy at room temperature. Large magnetodielectric/magnetoelectric response in this composite is possibly a result of the effective mechanical interaction between NiFe2O4 and BaTiO3 through the polymer matrix.
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