Magnetic Field Induced Ferroelectric Polarization Voltage In Compositional Dependent (0-3) Nfo/P(Vdf-Trfe) Nanocomposite Film

A novel two-phase multiferroic 0-3 nanocomposite (NC) films of NiFe2O4/P(VDF-TrFE) (thickness similar to 40 mu m) were fabricated for 0.2, 0.5, 1, 1.5 and 2 volume percentage of NiFe2O4 (NFO) particles in P(VDF-TrFE) matrix. Such flexible, thick, semi-crystalline NC films exhibit dielectric permittivity similar to 6.7 at room temperature with low dielectric loss tangent (tan delta). These NC films exhibit ferroelectricity up to 1% volume content of NFO at room temperature and the ferroelectricity decreases for higher volume percentage of NFO due to increase in conductivity and deterioration of ferroelectric polymer chain. This is also confirmed from J-E and SEM analysis. The NC films display magnetic behavior at room temperature due to incorporation of NFO nanoparticles. The transverse magnetoelectric coupling coefficient (alpha (V) (31)) value is found to be higher compared to longitudinal coupling coefficient (alpha (V) (33)) for composite films. The maximum alpha (V) (31) value is found to be 136.4 mVOe(-1)cm(-1) at 1.21 kOe DC magnetic field for 0.5% NFO/P(VDF-TrFE) poled composite film with application of 25 Oe alternating magnetic field. It is the highest ever reported value in case of (0-3) NFO/P(VDF-TrFE) composite. Hence, the NC films having less than 1% volume content of NFO would perform a wide range of potential applications as well as electrically controlled magnetic storage and sensor devices, etc.